y—x=—5,5+8x-8y=5+8(x-y)=45
∵x-y=5∴两边乘-1y-x=-55+8x-8y=5+8(x-y)=5+8×5=45 希望满意采纳,祝学习进步。
y-x=-(x-y)=-55+8x-8y=5+8(x-y)=5+8x5=45
y-x=-55+8x-8y= 5+8(x-y)=5+8*5=5+40=45
解:由x-y=5得-(x-y)=-5,则y-x=-5。5+8x-8y=5+8(x-y)=5+8*5=45