7(x-2)=2x+3怎么解-搜答案-搜搜做题作业网

X+X-10+X-2=36*33x-12=1083x=120x=40

(x+3)/(x+2)+(x+9)/(x+8)=(x+5)/(x+4)+(x+7)/(x+6)1+(x+5)/(x+2)(x+8)=1+(x+5)/(x+4)(x+6)x=-5再问：第二步那个1是怎么

((X-2)(X-4)-(X-3)^2)/(X-3)(X-4)=((X-5)(X-7)-(X-6)^2)/(X-6)(X-7),-1/(X^2-7X+12)=-1/(X^2-13X+42),6X=30

4+6X（3x-2）=16x4+18x-12=16x18x-16x=12-42x=8x=4

我给个思路吧（X+2-1/X+2)-(X+3-1/X+3)=（X+6-1/X+6)-(X+7-1/X+7)1-1/(X+2)-1+1/(X+3)=1-1/(X+6)-1+1/(X+7)剩下的就自己解决

-2x=-10x=5、、

3x-2x(x-1)=4*1.5-7x3x-2x^2+2x=6-7x2x^2-12x+6=0(x-3)^2=6x=3±√6再问：看不懂啊

再问：2x是怎么得来的

通分得[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(x+8)]/(x+8)(x+3)解得5/(x-3)(x-4)=5/(x+8)(x+3),

(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(

设t=(x-1)/x,则(7x-7)/2x=7t/2所以t-7t/2+3=0即t=6/5所以(x-1)/x=6/5x=-5再问：步骤再完善一点好吗？再答：设t=(x-1)/x，则(7x-7)/2x=7

通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2

首先由题意得x+1≠0,x+7≠0,x+5≠0,x+3≠0,即x≠-1,x≠-7,x≠-5,x≠-3,则先简化方程(x+1+1)/(x+1)+(x+7+1)/(x+7)=(x+5+1)/(x+5)+(

2x²+3=7x怎么解

2x²+3=7x2x^2-7x+3=02x-1x-3(2x-1)(x-3)=02x-1=0或x-3=0x1=1/2,x2=3

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

x=28再问：写清楚解答过程啊再答：25/28x=x-33=x-25/28x3=3/28xx=3*28/3x=28

问题是不是X2=(X+30)*(X-18）啊?要是上面的话就这样X2=X*X-X*18+30*X-30*18=X2+12X-540移项得：X2-X2-12X=-540,即-12X=-540,X=45*

等式两边*（X-2）（X+3)2(X+3)+x（Ｘ－２）＝（X-2）（X+3)２Ｘ+６+Ｘ平方-２Ｘ＝Ｘ平方+Ｘ-６Ｘ＝１２

7x-3(2/3x+1/5x)-(x+2/5x)+2x=5x7x-2x-3/5x-x-2/5x+2x,=5x7x-x=5x6x=5x6x-5x=0x=0再问：大哥=5x怎么求出再问：大哥=5x怎么求出