Question

化简1-x-3y分之x+y除以x平方-6xy+9y平方分之x平方-y平方

Answer 1

1- (x-3y)分之(x+y) ÷ [(x²-6xy+9y²)分之(x²-y²)]
=1-(x-3y)分之(x+y)×｛[(x+y)(x-y)] 分之(x-3y)² ｝
=1 - (x-y)分之(x-3y)
=(x-y)分之[x-y -(x-3y)]
=(x-y)分之2y

Answer 2

解：(x+y)/(1-x-3y) ÷ (x²-y²)/(x²-6xy+9y²)
=(x+y)/(1-x-3y) ÷ (x+y)(x-y)/(x-3y)²
=(x-3y)²/(1-x-3y)(x-y)

Answer 3

原式=（x+y)(x^2-6xy+9y)/（1-x-3y)(x^2-y^2)
=（x+y)(x-3y)^2/（1-x-3y)(x+y)(x-y)
= (x-3y)^2/（1-x-3y)(x-y)

Answer 4

那个年纪的题