来做题了,分式通分约分。
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1。约分:
(1)2bc/ac=2b/a. (2) (x+y)y/xy=(x+y)/x
(3) (x^2+xy)/(x+y)^2=x(x+y)/(x+y)^2 (4) (x^2-y^2)/(x-y)^2=(x+y)(x-y)/(x-y)^2
=x/(x+y) =(x+y)/(x-y)。
2。通分:
(1)2c/bd=8bc/4b^2d (2)2xy/(x+y)^2=2xy(x-y)/(x+y)^2(x-y)
3ac/4b^2=3acd/4b^2d x/(x^2-y^2)=x(x+y)/(x+y)^2(x-y)。
(1)2bc/ac=2b/a. (2) (x+y)y/xy=(x+y)/x
(3) (x^2+xy)/(x+y)^2=x(x+y)/(x+y)^2 (4) (x^2-y^2)/(x-y)^2=(x+y)(x-y)/(x-y)^2
=x/(x+y) =(x+y)/(x-y)。
2。通分:
(1)2c/bd=8bc/4b^2d (2)2xy/(x+y)^2=2xy(x-y)/(x+y)^2(x-y)
3ac/4b^2=3acd/4b^2d x/(x^2-y^2)=x(x+y)/(x+y)^2(x-y)。
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第三好像错的。。
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