搜搜考试网X*0.9=m 215 X*0.8=m-125
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X/0.24=2.4x=2.4x0.24x=0.5763X+2.7-0.9=7.893x=7.89+0.9-2.73x=6.09x=2.039.2X+0.8X=10810x=108x=10.82.5X
2X+40%X=7.22.4X=7.2X=35-2/3*X=1/3X=70.8+1/2*X=0.9X=0.2
（X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问：请问X(X+2)=99解为什么就等于9了呢没看懂再答：换成算术法你就明
1.两边同乘以10：即得2(x-1)-5(2x+5)=108x=-37得x=-37/8（-8分之37）2.x=-43.左边分子分母乘以100再算,右边0.3的分子分母乘以10,左右同乘以150240x
x÷0.8-x=45x-0.8x=45×0.8(1-0.8)x=360.2x=36x=36÷0.2x=180
0或41分之3200,用公式法解再问：是41分之80根号41....
20+0.8x=x-14x-0.8x=20+140.2x=34x=170112-4x=2x(80-4x)112-4x=160-8x8x-4x=160-1124x=48x=12
10-3x=410-4=3x6=3x∴x=20.9x=8.1x=915x-7.5x=157.5x=15x=20.8x+0.4x=1.21.2x=1.2x=1
0.9X-0.8X-215=0.8X+125-0.8X0.1X-215=1250.1X-215+215=125+2150.1X=3400.1X/0.1=340/0.1X=3400
x-0.8x=46(1-0.8)x=460.2x=46x=46÷0.2x=230如果帮到你,请记得采纳,O(∩_∩)O谢谢
移项1.3x-0.9x=11.6-0.80.4x=10.8x=10.8÷0.4x=27
X-0.8X=20.2X=2X=2/0.2X=10
x-4x=102-3x=102x=-34x-0.8x=220.2x=22x=110
0.2x=16x=80
(0.8x+0.9)÷0.5=(x+5)÷2+(0.3x-0.2)÷0.31.6X+1.8=0.5X+2.5+X-2/34.8X+5.4=1.5X+7.5+3X-20.3X=0.1X=1/3
原方程去括号,得：5x＋(0.9＋0.09＋0.009＋0.0009＋0.00009)=5.999995x＋0.99999=5.999995x=5.99999－0.999995x=5x=1
0.8x除以0.5+0.9=x除以2+5+0.3x除以3-0.20.8x乘2+0.9=x*1/2+5+0.3x*10/3-0.21.6x+0.9=1/2x+5+x-0.21.6x+0.9=1.5x+5
7X+83X=210x=7/3X+0.9X=38x=2011X-30=113x=1310.5+0.8X=14.5x=53X+47X=200x=412.5X+64=114x=4