55 | × | 100 | ÷ | X | ÷ | 21 20 | ÷ | 90 | × | 100 | = | 78 |
方程两边同时乘以: | X |
55 | × | 100 | ÷ | 21 20 | ÷ | 90 | × | 100 | = | 78 | X |
- | 78 | X | = | - | 55 | × | 100 | ÷ | 21 20 | ÷ | 90 | × | 100 |
- | 78 | X | = | - | 1100000 189 |
1100000 189 | = | 78 | X |
78 | X | = | 1100000 189 |
X | = | 1100000 189 | ÷ | 78 |
= | 1100000 189 | × | 1 78 |
= | 550000 189 | × | 1 39 |
X | = | 550000 7371 |
X | = | 74.616741 |