1.约分(1) (-16a²)/(20ab) (2) (2x-2y)/(x²-y²)2.通分:3x/x²-2x 2x+1/4-x² 3/2x²+4x3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成
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![1.约分(1) (-16a²)/(20ab) (2) (2x-2y)/(x²-y²)2.通分:3x/x²-2x 2x+1/4-x² 3/2x²+4x3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成](/uploads/image/z/4527743-23-3.jpg?t=1.%E7%BA%A6%E5%88%86%281%29+%28-16a%26%23178%3B%29%2F%2820ab%29+%282%29+%282x-2y%29%2F%28x%26%23178%3B-y%26%23178%3B%292.%E9%80%9A%E5%88%86%3A3x%2Fx%26%23178%3B-2x+2x%2B1%2F4-x%26%23178%3B+3%2F2x%26%23178%3B%2B4x3.%E5%9C%A83%E4%B8%AA%E6%95%B4%E5%BC%8Fx%26%23178%3B-1+x%26%23178%3B%2B2x%2B1+x%26%23178%3B%2Bx%E4%B8%AD%2C%E8%AF%B7%E4%BD%A0%E4%BB%8E%E4%B8%AD%E4%BB%BB%E6%84%8F%E9%80%89%E6%8B%A9%E4%B8%A4%E4%B8%AA%2C%E5%B0%86%E5%85%B6%E4%B8%AD%E4%B8%80%E4%B8%AA%E5%81%9A%E4%B8%BA%E5%88%86%E5%AD%90%2C%E5%8F%A6%E4%B8%80%E4%B8%AA%E4%BD%9C%E4%B8%BA%E5%88%86%E6%AF%8D%E7%BB%84%E6%88%90)
1.约分(1) (-16a²)/(20ab) (2) (2x-2y)/(x²-y²)2.通分:3x/x²-2x 2x+1/4-x² 3/2x²+4x3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成
1.约分(1) (-16a²)/(20ab) (2) (2x-2y)/(x²-y²)
2.通分:3x/x²-2x 2x+1/4-x² 3/2x²+4x
3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成一个分式,并将这个分式进行化简,再求x=2时分式的值
1.约分(1) (-16a²)/(20ab) (2) (2x-2y)/(x²-y²)2.通分:3x/x²-2x 2x+1/4-x² 3/2x²+4x3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成
1.约分(1) (-16a²)/(20ab)
=-4a/5b
(2) (2x-2y)/(x²-y²)
=2(x-y)/(x-y)(x+y)
=2/(x+y)
2.通分:3x/x²-2x =3x/x(x-2) =6x(x+2)/2x(x+2)(x-2)
2x+1/4-x²=-(2x+1)/(x-2)(x+2) =-2x(2x+1) /2x(x+2)(x-2)
3/2x²+4x=3/2x(x+2)=3(x-2)/2x(x+2)(x-2)
3.在3个整式x²-1 x²+2x+1 x²+x中,请你从中任意选择两个,将其中一个做为分子,另一个作为分母组成一个分式,并将这个分式进行化简,再求x=2时分式的值
(x²-1)/( x²+2x+1)=(x+1)(x-1)/(x+1)²=(x-1)/(x+1)
x=2时,原式=(2-1)/(2+1)=1/3