( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 2 | ÷ | 9 | − | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | = | 49 |
方程两边同时乘以: | ( | 2 | ÷ | 9 | − | x | ) |
( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | = | 49 | ( | 2 | ÷ | 9 | − | x | ) |
14 | ÷ | 9 | × | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | = | 49 | ( | 2 | ÷ | 9 | − | x | ) |
14 | ÷ | 9 | × | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | = | 49 | × | 2 | ÷ | 9 | − | 49 | x |
14 9 | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | = | 98 9 | − | 49 | x |
方程两边同时乘以: | ( | 20 | ÷ | 9 | ) |
14 9 | ( | 14 | ÷ | 9 | − | 2 | x | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | × | ( | 20 | ÷ | 9 | ) | = | 98 9 | ( | 20 | ÷ | 9 | ) | − | 49 | x | ( | 20 | ÷ | 9 | ) |
14 9 | × | 14 | ÷ | 9 | − | 14 9 | × | 2 | x | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | × | ( | 20 | ÷ | 9 | ) | = | 98 9 | ( | 20 | ÷ | 9 | ) | − | 49 | x | ( | 20 | ÷ | 9 | ) |
14 9 | × | 14 | ÷ | 9 | − | 14 9 | × | 2 | x | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | × | ( | 20 | ÷ | 9 | ) | = | 98 9 | × | 20 | ÷ | 9 | − | 49 | x | ( | 20 | ÷ | 9 | ) |
196 81 | − | 28 9 | x | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ÷ | ( | 20 | ÷ | 9 | ) | × | ( | 20 | ÷ | 9 | ) | = | 1960 81 | − | 49 | x | ( | 20 | ÷ | 9 | ) |
方程两边同时乘以: | ( | 20 | ÷ | 9 | ) |
196 81 | ( | 20 | ÷ | 9 | ) | − | 28 9 | x | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 1960 81 | ( | 20 | ÷ | 9 | ) | − | 49 | x | ( | 20 | ÷ | 9 | ) | ( | 20 | ÷ | 9 | ) |
196 81 | × | 20 | ÷ | 9 | − | 28 9 | x | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 1960 81 | ( | 20 | ÷ | 9 | ) | − | 49 | x | ( | 20 | ÷ | 9 | ) | ( | 20 | ÷ | 9 | ) |
196 81 | × | 20 | ÷ | 9 | − | 28 9 | x | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 1960 81 | × | 20 | ÷ | 9 | − | 49 | x | ( | 20 | ÷ | 9 | ) | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 28 9 | x | ( | 20 | ÷ | 9 | ) | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 49 | x | ( | 20 | ÷ | 9 | ) | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 28 9 | x | × | 20 | ÷ | 9 | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 49 | x | ( | 20 | ÷ | 9 | ) | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 28 9 | x | × | 20 | ÷ | 9 | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 49 | x | × | 20 | ÷ | 9 | × | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 560 81 | x | − | 2 | x | ( | 14 | ÷ | 9 | − | 2 | x | ) | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 980 9 | x | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 560 81 | x | − | 2 | x | × | 14 | ÷ | 9 | × | ( | 20 | ÷ | 9 | ) | + | 2 | x | × | 2 | x | = | 39200 729 | − | 980 9 | x | ( | 20 | ÷ | 9 | ) |
3920 729 | − | 560 81 | x | − | 2 | x | × | 14 | ÷ | 9 | × | ( | 20 | ÷ | 9 | ) | + | 2 | x | × | 2 | x | = | 39200 729 | − | 980 9 | x | × | 20 | ÷ | 9 |
3920 729 | − | 560 81 | x | − | 28 9 | x | ( | 20 | ÷ | 9 | ) | + | 4 | x | x | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 560 81 | x | − | 28 9 | x | × | 20 | ÷ | 9 | + | 4 | x | x | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 560 81 | x | − | 560 81 | x | + | 4 | x | x | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 1120 81 | x | + | 4 | x | x | ( | 20 | ÷ | 9 | ) | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 1120 81 | x | + | 4 | x | x | × | 20 | ÷ | 9 | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 1120 81 | x | + | 80 9 | x | x | = | 39200 729 | − | 19600 81 | x |
3920 729 | − | 1120 81 | x | + | 80 9 | x | x | = | 39200 729 | − | 19600 81 | x |