计算下列分式

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计算下列分式
计算下列分式

计算下列分式
(1)2a/5a²b+3b/10ab²=(2ab+3ab)/10a²b²=1/2ab(3)原式=[3xy(x+y)+2xy(2x+2y)]/[2x(x+y)²]=(3x²y+3xy²+4x²y+4xy²)/2x(x+y)²=7xy(x+y)/2x(x+y)²=7y/2(x+y)
(4)原式=[2x-(x+8y)]/[(x+8y)(x-8y)]=(x-8y)/[(x+8y)(x-8y)]=1/(x+8y)
(2)原式=(8m²p-15n³)/20mn²p²