初一数学题求解，高分悬赏！

Question

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Answer 1

1、-2x^2+x-3-(x-1)^2=-2x^2+x-3-x^2+2x-1=x^2+3x-4
x-1 (x-1)^2 x-1 1-2x 1
2、 -------- ÷ ---------- = -------- × --------- = ----------
1-2x 1-2x 1-2x (x-1)^2 x-1

3 4 6
3、 --------- -- ----------- = ----------
x x-1 x-x^2

3(x-1)-4x 6
--------------- = ------------
x-x^2 x-x^2

3(x-1)-4x =6
x=-9
1、（4a-b)(3a+2b)-6a(3a+b)=12a^2+5ab-2b^2-18a^2-6ab=-6a^2-ab-2b^2

2-x 3
2、 ------------ + -------- =1
3x-1 1-3x

2-x 3 2-x-3
---------- - --------- =1 -----------=1 -1-x=3x-1 x=0
3x-1 3x-1 3x-1

x x+3 (x-1)^2 x x-1 1
3、 ------ - -------- × ----------- =------ - ----- =------
x+1 x-1 (x+3)(x+1) x+1 x+1 x+1

1、x^3+3x^2-4x-12=x^2(x+3)-4(x+3)=(x+3)(x^2-4)=(x+3)(x+2)(x-2)

2 1 6
2、 ------ + ----- = -------
x+1 x-1 x^2-1

x-1+x+1 6
--------- = -------
x^2-1 x^2-1

2x=6
x=3

x+2-x+2 x^2-4 4
3、 ---------×---------= -----
x^2-4 x x

Answer 2

第一道题先去括号。该变号的变号

Answer 3

这处初二的题