( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 10 | × | 3 | = | 24000 |
方程左边 = | ( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 | = | 24000 |
方程左边 = | 1000 | × | 10 | + | x | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
= | 10000 | + | x | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
= | 10000 | + | 10 | x | + | 300 | × | 30 | + | 100 | × | 30 |
= | 10000 | + | 10 | x | + | 9000 | + | 3000 |
= | 22000 | + | 10 | x |
22000 | + | 10 | x | = | 24000 |
10 | x | = | 24000 | − | 22000 |
10 | x | = | 2000 |
x | = | 2000 | ÷ | 10 |
= | 2000 | × | 1 10 |
= | 200 | × | 1 |
x | = | 200 |