方程4x平方-7x＝3

x平方-8x+16=4x²-8x+16=4x²-8x+12=0﹙x-2﹚﹙x-6﹚=0x₁＝2.x₂=6x平方+5x-3=0x²+5x-3=0x&

化简：(1/x)*(1/(x+1))+(1/(x+1))*(1/(x+2))+(1/(x+2))*(1/(x+3))+(1/(x+3))*(1/(x+4))=4/21(1/x)-(1/(x+1))+(

3(x-2)/(x+3)(x-2)=4(x+1)/(x+1)(x-4)3/(x+3)=4/(x-4)所以3x-12=4x+12x=-24再问：你好........请问能不能不用约分的方法用同乘公分母的

x平方+x分之7+x平方-x分之3=x平方-1分之61分之6应该就是6吧?x²+7/x+x²-3/x=x²-6x²+x²-x²+7/x-3/

（x^2+x-3)/（x^2+x-2)=(2x^2+4x+1)/（x^2+2x+1)-1（x^2+x-3)/（x^2+x-2)=(x^2+2x)/（x^2+2x+1)1-1/（x^2+x-2)=1-1

x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1

x²+3x-4=0（x+4）（x-1）=0x+4=0或x-1=0x1=-4,x2=1x²-7x-18=0（x-9）（x+2）=0x-9=0或x+2=0x1=9,x2=-2

解方程：196x平方-1=0196x^2=114x=±1x1=1/14x2=-1/144x平方+12x+9=81(2x+3)^2=812x+3=±9x1=3x2=-6x平方-7x-1=0(x-3.5)

(1)x^2-3x+√x^2-3x+5=7设x^2-3x为a则原式为a+√a+5=7解得a1=4,a2=11把a1=4,a2=11代入原式得：x^2-3x=4,x^2-3x=11解得x1=1,x2=2

【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

x(x-4)=0,x1=0,x2=4

2x²+8x-10-3x+6-4x=2x²+7x-4=7x=11

-8x平方+10x=08x^2-10x=04x^2-5=0x(4x-5)=0x=0或x=5/44x平方=（3x-1）平方4x^2-(3x-1)^2=0(2x+3x-1)(2x-3x+1)=0(5x-1

2x^2+3x-4=2x^2+5/(3x)3x-4=5/(3x)9x^2-12x-5=0(3x-5)*(3x+1)=0所以：3x-5=0or3x+1=0解得：x1=5/3,x2=-1/3

144x平方-9=0x²=9/144x=3/12或x=-3/122x平方+3x+1=0(2x+1)(x+1)=0x1=-1/2x2=-125-10x+x平方=5-xx²-9x+20

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

可以写清楚点不?1分之x平方是不是1/x^2的意思啊1分之2x二x平方?再问：x平方=x^2再答：嗯，你还是全用汉字和数字再写一遍吧。。。。

(3x²-x-2)²=(2x²+4x-8)²-(x²-5x+6)²(3x²-x-2)²=[(2x²+4x-8)

(x平方+2x)(x平方+4x+3)=120X(X+2)(X+1)(X+3)=120[X(X+3)][(X+2)(X+1)]=120(X平方+3X)(X平方+3X+2)=120设X平方+3X=M,则M

x平方+1/x平方-3/x-3x+4=0x²+2+1/x²-3（x+1/x）+2=0(x+1/x)²-3(x+1/x)+2=0(x+1/x-1)(x+1/x-2)=0x+