(40+x)/(7.5+2.5)+x÷(7.5-2.5)=20,x得
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(40+x)/(7.5+2.5)+x÷(7.5-2.5)=20,x得
![(40+x)/(7.5+2.5)+x÷(7.5-2.5)=20,x得](/uploads/image/z/8247681-9-1.jpg?t=%2840%2Bx%29%2F%287.5%2B2.5%29%2Bx%C3%B7%287.5-2.5%29%3D20%2Cx%E5%BE%97)
![](http://img.wesiedu.com/upload/b/a7/ba73ac91fc5936af7d5834dc43289852.jpg)
(40+x)/(7.5+2.5)+x÷(7.5-2.5)=20,x得
5(x-7.5)=2.5x
7.5x+30=2.5x+100
50X+40X×(2.5X)=120 怎么解?
解方程:20%X+30%X=2.5; X-14
4X减3.7x=12 4.2x加2.5x=1.34 8X减3x=15.6 (x减3)除2=7.5 35X加13x=9.6
1.30x+20*7.5x=540
x加30%x=52、x减40%x=15、50%x加x=31.5、x减1%x=19.8、x加25%x=2.5、x减15%x
方程:2(x+3)=2.5(x-3) 2x+6=2.5x-7.5 2.5x-2x=6+7.5 ...如题
20/x=20/(x+2.5)+0.4
x/40+x/60+[20-(x/40+x/60)*8]÷40=x/40+(20-x)/8怎么解
2.5%X+(20-X)*2.25%=0.485