3X+2Y=54,2X+3Y=56.X=?Y=?要说明,不能用方程,
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3X+2Y=54,2X+3Y=56.X=?Y=?要说明,不能用方程,
3X+2Y=54,2X+3Y=56.X=?Y=?
要说明,不能用方程,
3X+2Y=54,2X+3Y=56.X=?Y=?要说明,不能用方程,
3X+2Y=54,2X+3Y=56
相加
5X+5Y=54+56
5(X+Y)=110
X+Y=22
3X+3Y=3*22=66
分别减去原来两个方程
所以X=10,Y=12
x=10 y=12
3X+2Y=54,2X+3Y=56
相加
5X+5Y=54+56
5(X+Y)=110
X+Y=22
3X+3Y=3*22=66
分别减去原来两个方程
所以X=10,Y=12
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