( | 540 | + | 900 | x | ) | ( | 1 | + | 8 | ÷ | 9 | × | x | ) | = | 575 |
方程左边 = | 540 | ( | 1 | + | 8 | ÷ | 9 | × | x | ) | + | 900 | x | ( | 1 | + | 8 | ÷ | 9 | × | x | ) |
= | 540 | × | 1 | + | 540 | × | 8 | ÷ | 9 | × | x | + | 900 | x | ( | 1 | + | 8 | ÷ | 9 | × | x | ) |
= | 540 | + | 480 | x | + | 900 | x | ( | 1 | + | 8 | ÷ | 9 | × | x | ) |
= | 540 | + | 480 | x | + | 900 | x | × | 1 | + | 900 | x | × | 8 | ÷ | 9 | × | x |
= | 540 | + | 480 | x | + | 900 | x | + | 800 | x | x |
= | 540 | + | 1380 | x | + | 800 | x | x |
540 | + | 1380 | x | + | 800 | x | x | = | 575 |
x1= | - | 7 4 |
x2= | 1 40 |