{X+Y=95,40%X+78%Y=60%×65 - 知识问答

{X+Y=95,40%X+78%Y=60%×65

2个回答

X+Y=95,40%X+78%Y=60%×65
X+Y=95,0.4X+0.78Y=39
0.4X+0.4Y=38------1式,0.4X+0.78Y=39----2式
2式-1式0.38Y=1
Y=50/19
代入X+Y=95,得
X=92又7/19

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