0.2x[3x-5] 3=0.4x[x-2] 4

3x+5x=(3+5)x=8x

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

这是两道题吗?1、两边同时乘(x-1)(x-2)(x-3）答案是x1=-1,x2=22、分母因式分解分别为(x-7)(2x+3)和(x-5)(x-7)然后同时乘(x-5)(x-7)(2x+3)答案是x

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7

x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=（x+x^2+x^3+x^4）+（x^5+x^6+x^7+x^8）=x（1+x+x^2+x^3）+x^5（1+x+x^2+x^3）=（x+x

3x*x=1+x得6x*x*x+7x*x-5x+2000=3x^2*2x+7x^2-5x+2000=(1+x)2x+7x^2-5x+2000=9x^2-3x+2000=3(3x^2-x)+2000=3

/>5（x^2-5x）=3x^2-3x=0即2x^2-8x=0解得x=0或4(2x-3)^2=9(2x+3)^2(2x-3)^2=[3(2x+3)]^22x-3=±3(2x+3)x1=-4x2=-3/

2-x+5/6=x-x-1/3两边乘612-x-5=6x-2x+27-x=4x+25x=5x=10.1-0.2x/0.03-1=0.7-x/0.4两边乘1.240-80x-1.2=5.1-3x77x=

x+3/20x=4623x/20=46x=46x20/23=40,x-1/5x=404x/5=40x=200/4=50,x-1/2x=3/4x/2=3/4x=3/2,x-0.2x=180.8x=18x

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)

原式=（-1/2+3)^2-(-1/2)*(-1/2-5)=(5/2)^2-(1/2)*(11/2)=25/4-11/4=14/4=7/2"^2"代表“2次方”

5x²-5x=3x²+3x5x²-3x²=5x+3x2x²=8x2x=8x=4这位同学,学习还是要靠自己,未来也要靠自己知识是有限的,但是学习能力却是

移项,2X=5,X=2.5

1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1=(1/2x^2-0.5x^2)+(0.25x-1/4x)+(0.2x^3-1/5x^3)+0.5x-1=0.

x=7.7/2=3.85

(2x-5)(3x+2)-6(x+1)(x-2)=6x²+4x-15x-10-6(x²+x-2x-2)=6x²-11x-10-6(x²-x-2)=6x²

#includesintjiesheng(intn)//用于计算阶乘如：3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x

5(x²-x)-3(x²+x)=0x(5x-5)-x(3x+3)=0x(5x-5-3x-3)=0x(2x-8)=02x(x-4)=0x=0,x=4(x-2)²=(2x+3

(1)3x(x+0.2)=4x(x-1.1)3x+0.6=4x-4.44x-3x=0.6+4.4x=5(2)乘以0.8得4(1-x)=3x4-4x=3x4=7xx=4/7（7分之4）（3）1.1x1.