初二数学约分和通分

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2 | 2011-2-20 19:13:46 | 显示全部楼层 |阅读模式

5X/25x^2=1/5x, (9ab^2+6abc)/3a^2b =3ab(3b+2c)/3a^2b =(3b+2c)/a (9a^2+6ab+b^2)/(3a+b) =(3a+b)^2/(3a+b) =3a+b (x^2-36)/(2x+12) =(x+6)(x-6)/2(x+6) =(x-6)/25)x/3y=2xy/6y^2,3x/2y^2=9x/6y^26)6c/a^2b=18c/3a^2b,c/3ab=ac/3a^2b,7)x/(2x+2y)=(x+y)/2(x+y)^2,xy/(x+y)^2=2xy/2(x+y)^2,8)2mn/(...

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