2014-12-07
展开全部
先做两题,其余你自己做吧
化简
(1)公因式是5abc
=[5abc(-5ac^2)]/[5abc(3b)]
=-5ac^2/(3b)
(2)(x+3)(x-3)/(x+3)^2
=(x-3)/(x+3)
通分
(1)公分母是abc
x/(ab)=cx/(abc)
y/(bc)=ay/(abc)
(4)公分母是(x+1)^2(x-1)
-x/(x^2+2x+1)
=-x/(x+1)^2
=-x(x-1)/[(x+1)^2(x-1)]
=(-x^2+x)/[(x+1)^2(x-1)]\
3/(x^2-1)
=3/[(x+1)(x-1)]
=3(x+1)//[(x+1)^2(x-1)]
=(3x+3)//[(x+1)^2(x-1)]
化简
(1)公因式是5abc
=[5abc(-5ac^2)]/[5abc(3b)]
=-5ac^2/(3b)
(2)(x+3)(x-3)/(x+3)^2
=(x-3)/(x+3)
通分
(1)公分母是abc
x/(ab)=cx/(abc)
y/(bc)=ay/(abc)
(4)公分母是(x+1)^2(x-1)
-x/(x^2+2x+1)
=-x/(x+1)^2
=-x(x-1)/[(x+1)^2(x-1)]
=(-x^2+x)/[(x+1)^2(x-1)]\
3/(x^2-1)
=3/[(x+1)(x-1)]
=3(x+1)//[(x+1)^2(x-1)]
=(3x+3)//[(x+1)^2(x-1)]
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展开全部
通风什么意思,我忘了。。
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