分式(x+y)的三次方分之1
1/(x+y)^3
x的平方+2xy+y的平方分之1
1/(x^2+2xy+y^2)=1/(x+y)^2
x-y分之1
1/(x-y)
最简公分母是
(x+y)^3*(x-y)
=(x-y)(x+y)^3.(3次方的意思)
分式(x+y)的三次方分之1
1/(x+y)^3
x的平方+2xy+y的平方分之1
1/(x^2+2xy+y^2)=1/(x+y)^2
x-y分之1
1/(x-y)
最简公分母是
(x+y)^3*(x-y)
=(x-y)(x+y)^3.(3次方的意思)