x2+Y2=20 X+Y=-5 求X-Y
问题描述:
x2+Y2=20 X+Y=-5 求X-Y
2代表平方
答
x2+Y2=(x+y)(x-y)=-5(x-y)=20x-y=-4
x2+Y2=20 X+Y=-5 求X-Y
2代表平方
x2+Y2=(x+y)(x-y)=-5(x-y)=20x-y=-4