解方程x-1 2x-3 3x-5-搜答案-智慧作业帮

x^4+2x^3+5x^2+4x-12=x^4-x³+3x³-3x²+8x²-8x+12x-12=x³(x-1)+3x²(x-1)+8x(x

x/(2x^2-11x-21)=(x+7)/(x^2-12x+35)x/(2x+3)(x-7)=(x+7)/(x-5)(x-7)x/(2x+3)=(x+7)/(x-5)x(x-5)=(x+7)(2x+

x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1

2x(x-1)-x(3x+2)=-x(x+2)-122x^2-2x-3x^2-2x=-x^2-2x-122x^2-3x^2+x^2-2x-2x+2x=-12-2x+12=0-2(x-6)=0x-6=0

【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x

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)

(2x-3/x)²+6(2x-3/x)+5=0(2x-3/x+5)(2x-3/x+1)=02x-3/x+5=02x-3/x+1=02x²+5x-3=02x²+x-3=0(

(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

两边同乘以（x^2+1）得5x+2=33(x+1)=33x+3327x=-31x=-31/27

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)

X+3X+5X+7X+9X+...99X=250(x+99x)*50/2=2502500x=250x=1/10

（x+5)(200-5x)=(x+5)(200-5x)+x(x+5)0＝x(x+5)x=0或X＝x+5x＝0或x=-5

3x+9=6x-126x-3x=12+93x=21x=79x-12-7x=52x=17x=8.5

2(x-3)(x+5)=x^2+(x+2)(x-2)+(x+7)2(x^2+2x-15)=x^2+x^2-4+x+72x^2+4x-30=2x^2+x+33x=33x=11

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

解方程2x-(x-8)X(x-5)

解5x=10-55x=5x=1(5+6-3)x=128x=12x=12÷8x=3/2

你懒惰了,通分得：50x=300x=6

解方程：(x-2)(x^2-6x-9)=x(x-5)(x-3)将方程展开：X^3-6x^2-9x-2x^2+12x+18=x^3-8x^2+15x合并同类项得：12x=18则x=18/12=3/2