若x-2y=-3则5-x+2y=?
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若x-2y=-3则5-x+2y=?
若x-2y=-3则5-x+2y=?
若x-2y=-3则5-x+2y=?
等于8
x-2y=-3,则X=-3+2y
5-x+2y=5-(-3+2y)+2y=5+3-2y+2y=8
5-x+2y=5-(x-2y)=5-(-3)=8
8
因为x-2y=-3
所以-(x+2y)=-3
所以5-(x+2y)=5-3=2
8
2
8
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