作业帮解方程12x减7x=305
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7x/(5x+12)=9/7两边乘7(5x+12)49x=45x+1084x=108x=27
8x/2分之1=5分之38x÷1/2=3/58x=1/2*3/5=3/10x=3/10*1/8x=3/80或8x÷1/2=3/516x=3/580x=3x=3/8075％x-4分之1x=93x/4-x
3.1x-x=7解方程2.1x=7x=7/2.1=70/21=10/33分之10施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习,将来必成大器,鄙人有个小小的考验请点击在下答
1/(x²-7x+12)=1/(x²+x+6)x²-7x+12=x²+x+68x=6x=3/4带回分式方程验证,分母≠0,x=3/4是方程的解.x=3/4
X=7(X-12)x=7x-846x=84x=84÷6x=14X-0.4X=0.540.6x=0.54x=0.54÷0.6x=0.9
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)
51-x=12/xx^2-51x+12=0x^2-51x+(51/2)^2-(51/2)^2+12=0(x-51/2)^2=2553/4x-51/2=±√2553/2x=(51±√2553)/2再问：
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
1/(x-6)+1/(x-11)=1/(x-7)+1/(x-12)(x-11)(x-7)(x-12)+(x-6)(x-7)(x-12)=(x-6)(x-11)(x-12)+(x-6)(x-11)(x-
-2x=-8x=4再答：谢谢
(x+1)(x+2)(x^2-2x-1)(x-3)(x-4)+24=0(x+1)(x-3)(x+2)(x-4)(x^2-2x-1)+24=0(x^2-2x-3)(x^2-2x-8)(x^2-2x-1)
12+x/(5+x)=12/712*7(5+x)+7x=12(5+x)72*(5+x)+7x=0360+79x=0x=-360/79经检验,x=-360/79是原方程的根
3x+9=6x-126x-3x=12+93x=21x=79x-12-7x=52x=17x=8.5
(1+7)x=168=8x=167x=167÷8x=20.875
x/（2x^2-11x-21）=（x+7）/(x^2-12x+35)x/（2x+3）(x-7)=（x+7）/(x-5)(x-7)约去x-7(显然x=7不是方程的根)x/（2x+3)=（x+7）/(x-
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x
16x=12x移项得：16x-12x=0合并同类项：4x=0x=0
7x+12=10x-1210x-7x=12+123x=24x=24/3x=8
x-2/3x=12(1-2/3)x=121/3x=12x=36x+2/7x=18(1+2/7)x=189/7x=18x=14