分式约分和通分(1),(2),是约分(3),(4)是通分通分要写出最简公分母,
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分式约分和通分
(1),(2),是约分
(3),(4)是通分
通分要写出最简公分母,
(1),(2),是约分
(3),(4)是通分
通分要写出最简公分母,
1:原式=a(a-b)/(a+b)(a-b)=a/(a+b)
2:原式=(3a+2b)(3a-2b)/(3a-2b)^2=(3a+2b)/(3a-2b)
3:左式=5/(x+1)(x-1),右式=x/(x-1)^2,两式通分
左式=5(x-1)/(x^3-x^2-x+1),右式=(x^2+x)/(x^3-x^2-x+1)
4:通分左式=2xy(x-y)/(x+y)^2(x-y)=(2x^2y-2xy^2)/(x^3+x^2y-xy^2-y^3)
右式=x(x+y)/(x+y)(x^2-y^2)=(x^2+xy)/(x^3+x^2y-xy^2-y^3)
2:原式=(3a+2b)(3a-2b)/(3a-2b)^2=(3a+2b)/(3a-2b)
3:左式=5/(x+1)(x-1),右式=x/(x-1)^2,两式通分
左式=5(x-1)/(x^3-x^2-x+1),右式=(x^2+x)/(x^3-x^2-x+1)
4:通分左式=2xy(x-y)/(x+y)^2(x-y)=(2x^2y-2xy^2)/(x^3+x^2y-xy^2-y^3)
右式=x(x+y)/(x+y)(x^2-y^2)=(x^2+xy)/(x^3+x^2y-xy^2-y^3)