【【【急】】】分式计算题3道.速度的再加10.1.x+y/x-y · x-y/x+y2.3a-3b/10ab · 25a^2b^3/a^2-b^23.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy

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【【【急】】】分式计算题3道.速度的再加10.1.x+y/x-y · x-y/x+y2.3a-3b/10ab · 25a^2b^3/a^2-b^23.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy
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【【【急】】】分式计算题3道.速度的再加10.1.x+y/x-y · x-y/x+y2.3a-3b/10ab · 25a^2b^3/a^2-b^23.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy
【【【急】】】分式计算题3道.速度的再加10.
1.x+y/x-y · x-y/x+y
2.3a-3b/10ab · 25a^2b^3/a^2-b^2
3.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy

【【【急】】】分式计算题3道.速度的再加10.1.x+y/x-y · x-y/x+y2.3a-3b/10ab · 25a^2b^3/a^2-b^23.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy
1.x+y/x-y · x-y/x+y
=(x+y)(x-y) / (x+y)(x-y)
=1
2.3a-3b/10ab · 25a^2b^3/a^2-b^2
=15(a-b)a^2b^3 / 2(a+b)(a-b)ab
=15ab^2/2(a+b)
=15ab^2/(2a+2b)
3.x^2-4y^2/x^2+2xy+y^2 ÷ x+2y/2x^2+2xy
=(x+2y)(x-2y) / (x+y)^2 ÷ (x+2y) / 2x(x+y)
=2x(x+2y)(x-2y)(x+y) / (x+y)^2(x+2y)
=2x(x-2y)/(x+y)
=(2x^2-4xy)/(x+y)