百分之0.2乘以5000x=1200-搜答案-智慧作业帮

4.85%*（1+x）^2=8%(1+x）^2=1.651+x=+-1.28x=0.28或-2.28表示一楼回答错误,1.65开根号是0.82?你把1/2次方当成乘以1/2了

50%x=11.60.5x=11.6x=11.6÷0.5x=23.2百分之35x=40.35x=4x=4÷0.35x=80/7x-百分之75x=28x-0.75x=280.25x=28x=28÷0.2

(1)3x+0.9*4=93x+3.6=93x=9-3.63x=5.4x=1.8(2)0.4x-10=140.4x=4x=10(3)1/2-0.2x=1/510*(1/2-0.2x)=1/5*105-

（x+x+三分之一x)乘以3=3087x=308x=440.3x+0.2乘以（160-x)=360.3x+32-0.2x=360.1x=4x=40x+10=40%乘以（36-x+0）x+10=14.4

(3.5*0.25+3.5*0.75)第一个分解+360*0.25+36.5*0.25将3.5*0.25与360*0.25+36.5*0.25提0.25结合得100再加3.5*0.75如果不直接算的话

x=6327y=2025

原方程可化为：400*(0.75x)-99x=0.1300x-99x=0.1201x=0.12010x=1解得：x=2010分之1

(1+√2)x^2-(1-√2)x=0x[(1+√2)x-(1-√2)]=0x=0或x=(1-√2)/(1+√2)=-(1-√2)^2=2√2-3x=0或x=2√2-3

由题意得1.4x×0.8-x=151.12x-x=150.12x=153/25x=15x=15×25/3x=125

2*0.2x-3*0.3x+5*0.4x=0.3*50.4x-0.9x+2x=1.51.5x=1.5x=1

30%x+40%y=5.360%y-50%x=1+30%即3x+4y=53(1)6y-5x=13(2)(1)×3得：9x+12y=159(3)(2)×2得：12y-10x=26(4)(3)-(4)得：

[-270]乘以4分之1+0.25乘以21.5+[-8又2分之1]乘以[-百分之25]=（-270）X1/4+0.25X21.5+(-8又1/2)X(-25/100)=0.25X21.5-270X1/

先同时乘以105/3x+7/4（88-x)=150同时乘以1220x+21（88-x)=1800-x+1848=1800x=48

30%-20%x=x-1.8x+0.2x=0.3+1.81.2x=2.1x=2.1÷1.2x=7/41

X30%×50+5X=16020X=160X=8

1乘以2分之x+2乘以3分之x+.+2012乘以2013分之x=2012(1-1/2+1/2-1/3+……+1/2012-1/2013)x=2012(1-1/2013)x=20122012/2013x

0.6乘以1.5减去2分之1x等于百分之800.9减去2分之1x=0.82分之1x=0.9-0.82分之1x=0.1x=0.1÷2分之1x=0.2

X的平方+【根号三+1】乘以X=0x（x+1+√3）=0x1=0x2=-1-√3

1:40X%+21=37两边同乘以100得：40X+2100=370040X=3700-210040X=1600X=40.2：X-78X%=2.2两边同乘以100得：100X-78X=22022X=2

x-80%x=4020%x=40x=40÷0.2x=200