x2-y2=48,x+y=6,则x-y=()
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x2-y2=48,x+y=6,则x-y=()
x2-y2=48,x+y=6,则x-y=()
x2-y2=48,x+y=6,则x-y=()
x-y
=(x^2-y^2)÷(x-y)
=48÷6
=8
(X+Y)(X-Y)=48 x-y=8
那个2是平方吧?
第二个式子:x=6-y;代入一式,得:y=-1,回代,x=7;x-y=8.
若x+y=6,x2-y2=48,则x-y=_____
x2-y2=48,x+y=6,则x-y=()
我做对了吗.x2(x-y)+y2(y-x)= x2(x-y)-y2(x-y)=x2-y2=(x+y)(x-y)
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