x加2x加2等于20的方程怎么解-搜答案-大师作文网

x２+2+1/x=2(x+1/x)x２+2+1/x=2x+2/xx２-2x+2=1/x画图象,得x=1

30%为0.3也就是3/10（x-2/5+14-x）/x=3/10（2/5+14）/x=3/10x=3/144

(5x+2)/(x^2+x)=3/(x+1)(5x+2)/x=35x+2=3x2x+2=0x=-1不知原式写对了没有?

3x+2=4x+13x-4x=1-2-x=-1x=1

2x^2+6x-20/(x^2+3x)=182(x^2+3x)-20/(x^2+3x)=18令a=x^2+3x且a≠0得2a-20/a=182a^2-18a-20=0(2a-20)(a+1)=0a=1

x/(x+1)+(x-1)=2则x+1≠0,即x≠-1去分母：x+x2-1=2x+2整理得：x2-x-3=0即x=(1-√13)/2或x=(1+√13)/2

题目好乱!有好几种意思

x+3=2x+5x-x+3=2x-x+53=x+53-5=xx=-2

20加20加3.14乘2乘x等于77.6840+6.28x=77.68；6.28x=37.68；x=6；手机提问的朋友在客户端右上角评价点【满意】即可.

X+(X+2)+X/4=742X+X/4=728X+x=2889X=288X=32

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

(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x

2/5x+20=1/2x20=1/10xx=200

X²+4X+2=0,X²+4X+4-2=0,（X+2）²-2=0那么X+2=±√2,所以X=±√2－2

2(13＋x)=37＋x26＋2x=37＋x2x－x=37－26x=11

x+20%=401.2x=40x=40÷1.2x=100/3

x=1再问：给个过程吧