3X+2Y=320 4X+3Y=440 2X+1Y=?

2015-09-15 4:49 am

回答 (1)

2015-09-16 7:27 am

3x + 2y = 320 ...... [1]
4x + 3y = 440 ...... [2]

[1] * 2 :
6x + 4y = 640 ...... [3]

[3] - [2] :
2x + y = 200 ...... (答案)

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