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On line solution of multivariate equations：
    First set the elements of the equation (i.e. the number of unknowns), then click the "Next" button to enter the coefficients of each element of the equation set, and click the "Next" button to obtain the solution of the equation set.
    Note that the coefficients of each element of the equation system can only be numbers, not algebraic expressions (including mathematical functions).
    Current location：Equations > Multivariate equations > Answer
detailed information：
The input equation set is:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 D + E + F = 0    (3)
-10B -8D + 2F = 40    (4)
 10A + 10B -4C = 20    (5)
 4C + 8D -8E = -20    (6)
Question solving process:

Multiply both sides of equation (1) by 10, the equation can be obtained:
         10A -10B -10F = 0    (7)
, then subtract both sides of equation (7) from both sides of equation (5), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 D + E + F = 0    (3)
-10B -8D + 2F = 40    (4)
 20B -4C + 10F = 20    (5)
 4C + 8D -8E = -20    (6)

Multiply both sides of equation (2) by 10, the equation can be obtained:
         10B + 10C -10D = 0    (8)
, then add the two sides of equation (8) to both sides of equation (4), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 D + E + F = 0    (3)
 10C -18D + 2F = 40    (4)
 20B -4C + 10F = 20    (5)
 4C + 8D -8E = -20    (6)

Multiply both sides of equation (2) by 20, the equation can be obtained:
         20B + 20C -20D = 0    (9)
, then subtract both sides of equation (9) from both sides of equation (5), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 D + E + F = 0    (3)
 10C -18D + 2F = 40    (4)
-24C + 20D + 10F = 20    (5)
 4C + 8D -8E = -20    (6)

交After the exchange of equation (3) and equation (4)， the equation system becomes:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
-24C + 20D + 10F = 20    (5)
 4C + 8D -8E = -20    (6)

Multiply both sides of equation (3) by 12
Divide the two sides of equation (3) by 5, the equation can be obtained:
         24C - 
216
5
D + 
24
5
F = 96    (10)
, then add the two sides of equation (10) to both sides of equation (5), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
- 
116
5
D + 
74
5
F = 116    (5)
 4C + 8D -8E = -20    (6)

Multiply both sides of equation (3) by 2
Divide the two sides of equation (3) by 5, the equation can be obtained:
         4C - 
36
5
D + 
4
5
F = 16    (11)
, then subtract both sides of equation (11) from both sides of equation (6), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
- 
116
5
D + 
74
5
F = 116    (5)
 
76
5
D -8E - 
4
5
F = -36    (6)

Multiply both sides of equation (4) by 116
Divide the two sides of equation (4) by 5, the equation can be obtained:
         
116
5
D + 
116
5
E + 
116
5
F = 0    (12)
, then add the two sides of equation (12) to both sides of equation (5), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
 
116
5
E + 38F = 116    (5)
 
76
5
D -8E - 
4
5
F = -36    (6)

Multiply both sides of equation (4) by 76
Divide the two sides of equation (4) by 5, the equation can be obtained:
         
76
5
D + 
76
5
E + 
76
5
F = 0    (13)
, then subtract both sides of equation (13) from both sides of equation (6), the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
 
116
5
E + 38F = 116    (5)
- 
116
5
E -16F = -36    (6)

Add both sides of equation (5) to both sides of equation (6) ,the equations are reduced to:
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
 
116
5
E + 38F = 116    (5)
 22F = 80    (6)

Multiply both sides of equation (6) by 19
Divide both sides of equation (6) by 11, get the equation：
         38F = 
1520
11
    (14)
, then subtract both sides of equation (14) from both sides of equation (5), get the equation：
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E + F = 0    (4)
 
116
5
E = - 
244
11
    (5)
 22F = 80    (6)

Divide both sides of equation (6) by 22, get the equation：
         F = 
40
11
    (15)
, then subtract both sides of equation (15) from both sides of equation (4), get the equation：
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D + 2F = 40    (3)
 D + E = - 
40
11
    (4)
 
116
5
E = - 
244
11
    (5)
 22F = 80    (6)

Divide both sides of equation (6) by 11, get the equation：
         2F = 
80
11
    (16)
, then subtract both sides of equation (16) from both sides of equation (3), get the equation：
 A -1B -1F = 0    (1)
 B + C -1D = 0    (2)
 10C -18D = 
360
11
    (3)
 D + E = - 
40
11
    (4)
 
116
5
E = - 
244
11
    (5)
 22F = 80    (6)

Divide both sides of equation (6) by 22, get the equation：
         F = 
40
11
    (17)
, then add the two sides of equation (17) to both sides of equation (1), get the equation：
 A -1B = 
40
11
    (1)
 B + C -1D = 0    (2)
 10C -18D = 
360
11
    (3)
 D + E = - 
40
11
    (4)
 
116
5
E = - 
244
11
    (5)
 22F = 80    (6)

Multiply both sides of equation (5) by 5
Divide both sides of equation (5) by 116, get the equation：
         E = - 
305
319
    (18)
, then subtract both sides of equation (18) from both sides of equation (4), get the equation：
 A -1B = 
40
11
    (1)
 B + C -1D = 0    (2)
 10C -18D = 
360
11
    (3)
 D = - 
855
319
    (4)
 
116
5
E = - 
244
11
    (5)
 F = 
40
11
    (6)

Multiply both sides of equation (4) by 18, get the equation：
         18D = - 
15390
319
    (19)
, then add the two sides of equation (19) to both sides of equation (3), get the equation：
 A -1B = 
40
11
    (1)
 B + C -1D = 0    (2)
 10C = - 
450
29
    (3)
 D = - 
855
319
    (4)
 E = - 
305
319
    (5)
 F = 
40
11
    (6)

Add both sides of equation (4) to both sides of equation (2), get the equation：
 A -1B = 
40
11
    (1)
 B + C = - 
855
319
    (2)
 10C = - 
450
29
    (3)
 D = - 
855
319
    (4)
 E = - 
305
319
    (5)
 F = 
40
11
    (6)

Divide both sides of equation (3) by 10, get the equation：
         C = - 
45
29
    (20)
, then subtract both sides of equation (20) from both sides of equation (2), get the equation：
 A -1B = 
40
11
    (1)
 B = - 
360
319
    (2)
 10C = - 
450
29
    (3)
 D = - 
855
319
    (4)
 E = - 
305
319
    (5)
 F = 
40
11
    (6)

Add both sides of equation (2) to both sides of equation (1), get the equation：
 A = 
800
319
    (1)
 B = - 
360
319
    (2)
 C = - 
45
29
    (3)
 D = - 
855
319
    (4)
 E = - 
305
319
    (5)
 F = 
40
11
    (6)

The coefficient of the unknown number is reduced to 1, and the equations are reduced to：
 A = 
800
319
    (1)
 B = - 
360
319
    (2)
 C = - 
45
29
    (3)
 D = - 
855
319
    (4)
 E = - 
305
319
    (5)
 F = 
40
11
    (6)


Therefore, the solution of the equation set is:
A = 
800
319
B = - 
360
319
C = - 
45
29
D = - 
855
319
E = - 
305
319
F = 
40
11


Convert the solution of the equation set to decimals:
A = 2.507837
B = -1.128527
C = -1.551724
D = -2.680251
E = -0.956113
F = 3.636364

解方程组的详细方法请参阅：《多元一次方程组的解法》
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