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送10分題﹕解以下聯立方程

發問:

6C-5D+2=7C-4D-5=3C+2D-7

最佳解答:

6C - 5D + 2 = 3C + 2 D - 7...................(1) 7C - 4D - 5 = 3C + 2 D - 7.....................(2) From (1), 3C - 7D = -9 18C - 42D = -54.....................................(3) From (2), 4C - 6D = -2 28C - 42D = -14.......................................(4) (4) - (3) 28C - 42D - 18C + 42D = -14 + 54 10C = 40 C = 4 // Substitute C = 4 into (3) 72 - 42D = -54 -42D = - 126 D = 3 // THe solution is C = 4, D = 3/

其他解答:

2c+d-4|||||2c+d-4
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