0.4x+0.8=2.8
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0.4X+(20-X)0.8=100.4x+16-0.8x=10-0.4x=10-16-0.4x=-6x=15
3.6X=5.4X=1.5
25%x=4.75x=4.75/25%x=192x-4=162x=16+42x=20x=20/2x=102分之1x+3分之1x=155/6x=15x=15/5/6x=180.8X(x-0.4)=8x-
(1)0.8x+0.4x=1.2, 1.2x=
再答:望采纳再问:Thankyou
X-0.4X=360.6X=36X=60
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
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
这不是扯淡嘛,合并同类项,1.2x=1.2,x=1
X-0.8X=20.2X=2X=2/0.2X=10
0.8x-0.32=80.8x=8.32x=10.4
x-4x=102-3x=102x=-34x-0.8x=220.2x=22x=110
0.2x=16x=80
5(2-x)=-(2x-7)0.5x-2=0.8(2x-1.5)2(x+0.5)-3(x-0.4)=5.610-5x=-2x+70.5x-2=1.6x-1.22x+1-3x+1.2=5.6-5x+2x
1,3x-4+2x=4x-35x-4x=4-3x=12,2.8x=19.32-6.4x2.8x+6.4x=19.329.2x=19.32x=2.13,0.4(x-0.2)+1.5=0.7x-0.380
原方程化为0.4x+13.6x-0.8x²=10那么-0.8x²+14x-10=0故2x²-35x+25=0即求得x=5(7±√41)/4
2.4x=0.36x=0.15
X+8.7-1.45=13.45X=13.45-8.7+1.45X=6.20.8X-0.7*4=5.50.8X-2.8=5.50.8X=5.5+2.8X=83/83X+5X=57.68X=57.6X=
x-0.8x=7.2合并同类项0.2x=7.2x的系数化为1x=72/2x=362.8x+x=26.6合并同类项3.8x=26.6x的系数化为1x=266/38x=7