{X+Y=95,40%X+78%Y=60%×65_数学解答

{X+Y=95,40%X+78%Y=60%×65

人气：279 ℃　时间：2020-02-06 01:40:12

解答

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