4X+5Y=34 5X+4Y
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4X+5Y=34 5X+4Y
4X+5Y=34 5X+4Y
4X+5Y=34 5X+4Y
若原题是:
4X+5Y=34 ①
5X+4Y=38 ②
①*5得20X+25Y=170 ③
②*4得20X+16Y=152 ④
③-④得9Y=18,
∴Y=2,
把Y=2代入①,得
4X+5*2=34
解得X=6
∴X=6
Y=2
(若数据不同,方法相同,有疑问,)
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4X+5Y=34 5X+4Y
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