Mathematics
         
语言:中文    Language:English
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:
 100A -1B = 150    (1)
 100A + 3B -1C = 150    (2)
 100A + 3B + 3C -1D = 0    (3)
 100A + 3B + 3C + 3D -1E = 0    (4)
 100A + 3B + 3C + 3D + 3E -1F = 0    (5)
 B + C + D + E + F = 50    (6)
Question solving process:

Subtract both sides of equation (1) from both sides of equation (2) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 100A + 3B + 3C -1D = 0    (3)
 100A + 3B + 3C + 3D -1E = 0    (4)
 100A + 3B + 3C + 3D + 3E -1F = 0    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (1) from both sides of equation (3) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4B + 3C -1D = -150    (3)
 100A + 3B + 3C + 3D -1E = 0    (4)
 100A + 3B + 3C + 3D + 3E -1F = 0    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (1) from both sides of equation (4) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4B + 3C -1D = -150    (3)
 4B + 3C + 3D -1E = -150    (4)
 100A + 3B + 3C + 3D + 3E -1F = 0    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (1) from both sides of equation (5) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4B + 3C -1D = -150    (3)
 4B + 3C + 3D -1E = -150    (4)
 4B + 3C + 3D + 3E -1F = -150    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (2) from both sides of equation (3) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4B + 3C + 3D -1E = -150    (4)
 4B + 3C + 3D + 3E -1F = -150    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (2) from both sides of equation (4) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4C + 3D -1E = -150    (4)
 4B + 3C + 3D + 3E -1F = -150    (5)
 B + C + D + E + F = 50    (6)

Subtract both sides of equation (2) from both sides of equation (5) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4C + 3D -1E = -150    (4)
 4C + 3D + 3E -1F = -150    (5)
 B + C + D + E + F = 50    (6)

Divide the two sides of equation (2) by 4, the equation can be obtained:
         B 
1
4
C = 0    (7)
, then subtract both sides of equation (7) from both sides of equation (6), the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4C + 3D -1E = -150    (4)
 4C + 3D + 3E -1F = -150    (5)
 
5
4
C + D + E + F = 50    (6)

Subtract both sides of equation (3) from both sides of equation (4) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4C + 3D + 3E -1F = -150    (5)
 
5
4
C + D + E + F = 50    (6)

Subtract both sides of equation (3) from both sides of equation (5) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4D + 3E -1F = 0    (5)
 
5
4
C + D + E + F = 50    (6)

Multiply both sides of equation (3) by 5
Divide the two sides of equation (3) by 16, the equation can be obtained:
         
5
4
C 
5
16
D = 
375
8
    (8)
, then subtract both sides of equation (8) from both sides of equation (6), the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4D + 3E -1F = 0    (5)
 
21
16
D + E + F = 
775
8
    (6)

Subtract both sides of equation (4) from both sides of equation (5) ,the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4E -1F = 0    (5)
 
21
16
D + E + F = 
775
8
    (6)

Multiply both sides of equation (4) by 21
Divide the two sides of equation (4) by 64, the equation can be obtained:
         
21
16
D 
21
64
E = 0    (9)
, then subtract both sides of equation (9) from both sides of equation (6), the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4E -1F = 0    (5)
 
85
64
E + F = 
775
8
    (6)

Multiply both sides of equation (5) by 85
Divide the two sides of equation (5) by 256, the equation can be obtained:
         
85
64
E 
85
256
F = 0    (10)
, then subtract both sides of equation (10) from both sides of equation (6), the equations are reduced to:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4E -1F = 0    (5)
 
341
256
F = 
775
8
    (6)

Multiply both sides of equation (6) by 256
Divide both sides of equation (6) by 341, get the equation:
         F = 
24800
341
    (11)
, then add the two sides of equation (11) to both sides of equation (5), get the equation:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D -1E = 0    (4)
 4E = 
24800
341
    (5)
 
341
256
F = 
775
8
    (6)

Divide both sides of equation (5) by 4, get the equation:
         E = 
6200
341
    (12)
, then add the two sides of equation (12) to both sides of equation (4), get the equation:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C -1D = -150    (3)
 4D = 
6200
341
    (4)
 4E = 
24800
341
    (5)
 F = 
24800
341
    (6)

Divide both sides of equation (4) by 4, get the equation:
         D = 
1550
341
    (13)
, then add the two sides of equation (13) to both sides of equation (3), get the equation:
 100A -1B = 150    (1)
 4B -1C = 0    (2)
 4C = 
49600
341
    (3)
 4D = 
6200
341
    (4)
 E = 
6200
341
    (5)
 F = 
24800
341
    (6)

Divide both sides of equation (3) by 4, get the equation:
         C = 
12400
341
    (14)
, then add the two sides of equation (14) to both sides of equation (2), get the equation:
 100A -1B = 150    (1)
 4B = 
12400
341
    (2)
 4C = 
49600
341
    (3)
 D = 
1550
341
    (4)
 E = 
6200
341
    (5)
 F = 
24800
341
    (6)

Divide both sides of equation (2) by 4, get the equation:
         B = 
3100
341
    (15)
, then add the two sides of equation (15) to both sides of equation (1), get the equation:
 100A = 
48050
341
    (1)
 4B = 
12400
341
    (2)
 C = 
12400
341
    (3)
 D = 
1550
341
    (4)
 E = 
6200
341
    (5)
 F = 
24800
341
    (6)

The coefficient of the unknown number is reduced to 1, and the equations are reduced to:
 A = 
961
682
    (1)
 B = 
3100
341
    (2)
 C = 
12400
341
    (3)
 D = 
1550
341
    (4)
 E = 
6200
341
    (5)
 F = 
24800
341
    (6)


Therefore, the solution of the equation set is:
A = 
961
682
B = 
3100
341
C = 
12400
341
D = 
1550
341
E = 
6200
341
F = 
24800
341


Convert the solution of the equation set to decimals:
A = 1.409091
B = -9.090909
C = -36.363636
D = 4.545455
E = 18.181818
F = 72.727273

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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