3Y+2X=222.2
3X+2Y=212.3
相加得 5x +5y = 434.5
x+ y = 86.9
所以 y = (3Y+2X)- 2(x+y) = 222.2 - 2x86.9= 48.4
x= 86.9 -48.4 =38.5
如何解3Y+2X=222.2 3X+2Y=212.3 X和Y分别等于多少?
如何解3Y+2X=222.2 3X+2Y=212.3 X和Y分别等于多少?
数学人气:177 ℃时间:2020-02-05 20:53:21
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