一些因式分解计算题,数学高手进来! 10

1.)2a+3分之2+3-2a分之3+4a^2-9分之2a+152.)x+3分之1+x^2-9分之6-6-2x分之x-13.)(x-1分之x+1+x^2+2x-1分之1)... 1. ) 2a+3分之2 +3-2a分之3 +4a^2-9分之2a+15
2. ) x+3分之1 +x^2-9分之6 -6-2x分之x-1
3. ) (x-1分之x+1 +x^2+2x-1分之1)除以x-1分之x^2
4. ) (1+ x-1分之1)除以 x^2-1分之x
5. ) x-1分之2-x 除以(x+1- x-1分之3)
6. ) x^2+x-2分之3x+3 除以(x-2+ x+2分之3)- 1-x分之1
就六道题,要过程,谢谢!
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a111216
2012-02-22 · TA获得超过181个赞
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1) 2/(2a+3)+3/(3-2a)+(2a+15)/(4a²-9)
=(4a-6)/(4a²-9)-(6a+9)/(4a²-9)+(2a+15)/(4a²-9)
=(4a-6-6a-9+2a+15)/(4a²-9)
=0
2) 1/(x+3)+6/(x²-9)-(x-1)/(6-2x)
=2(x-3)/2(x+3)(x-3)+6*2/2(x+3)(x-3)+(x-1)(x+3)/2(x+3)(x-3)
=【(2x-6)+12+(x-1)(x+3)】/2(x+3)(x-3)
=(x²+2x-3+2x-6+12)/2(x+3)(x-3)
=(x²+4x+3)/2(x+3)(x-3)
=(x+3)(x+1)/2(x+3)(x-3)
=(x+1)/2(x-3)
3) (x-1分之x+1 +x^2+2x-1分之1)除以x-1分之x^2 由于打字原因 我擅自更改下题目 题意不变
(x-1分之x+1 +x^2+2x-1分之1)乘以分之x^2分之x-1
【(x+1)/(x-1)+1/(x²+2x-1)】× (x-1)/x²
=(x+1)(x-1)/(x-1)x²+(x-1)/(x²+2x-1)x²
=(x+1)/x²+(x-1)/(x²+2x-1)x²
=(x+1)(x²+2x-1)/(x²+2x-1)x²+(x-1)/(x²+2x-1)x²
=(x³+2x²-x+x²+2x-1+x-1)/(x²+2x-1)x²
=(x³+3x²+2x-2)/(x²+2x-1)x²
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(1)2/(2a+3)+3/(3-2a)+(2a+15)/(4a^2-9)第一题是这样吗?实在分不清哪个是分母,都没括号啊。
2/(2a+3)+3/(3-2a)+(2a+15)/(4a^2-9)
=(2a+15)/(9-4a^2)+(2a+15)/(4a^2-9)
=0
(2)1/(x+3)+6/(x^2-9)-(x-1)/(6-2x)
=(x-3)/(x^2-9)+6/(x^2-9)-(x-1)/(6-2x)
=1/(x-3)-(x-1)/(6-2x)
=(x+1)/(2x-6)
(3)[(x+1)/(x-1)+1/(x^2+2x-1)]/(x^2)/(x-1)
=[(x+1)/(x-1)+1/(x^2+2x-1)]*(x-1)/(x^2)
=(x+1)/x^2+(x-1)/(x^4+2x^3-x^2)
=(x^3+3x^2+2x-2)/(x^4+2x^3-x^2)
(4)[1+1/(x-1)]/x/(x^2-1)
=[1+1/(x-1)]*(x^2-1)/x
=(x^2-1)/x+(x+1)/x
=x+1
(5)[(2-x)/(x-1)]/[x+1-3/(x-1)
=[(2-x)/(x-1)]/[(x^2-4)/(x-1)]
=[(2-x)/(x-1)]*[(x-1)/(x^2-4)]
=-1/(x+2)
(6)[(3x+3)/(x^2+x-2)]/[x-2+3/(x+2)-1(1-x)]
=[(3x+3)/(x^2+x-2)]/[(x^3-x^2+3)/(x+2)(x-1)]
=(3x+3)/(x^3-x^2+3)
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