( | 200 | + | x | ) | ÷ | ( | 228 | + | x | ) | = | 99 100 |
方程两边同时乘以: | ( | 228 | + | x | ) |
( | 200 | + | x | ) | = | 99 100 | ( | 228 | + | x | ) |
200 | + | x | = | 99 100 | ( | 228 | + | x | ) |
200 | + | x | = | 99 100 | × | 228 | + | 99 100 | x |
200 | + | x | = | 5643 25 | + | 99 100 | x |
x | − | 99 100 | x | = | 5643 25 | − | 200 |
1 100 | x | = | 5643 25 | − | 200 |
1 100 | x | = | 643 25 |
x | = | 643 25 | ÷ | 1 100 |
= | 643 25 | × | 100 |
= | 643 | × | 4 |
x | = | 2572 |