(40-X)/40-(40-X)/(40+200)=10%
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(40-40x)x+40x=40-32.4
8x=9x×(x-40)
(X/80+X/100 +5)*40=X,
x(40-2x)=250求x
(4x-40)+x=420 x=?
2(15+2x)x+40x=246
(x+6)/(40+x)=20%求x.
(x-3)/x=40% x=?
2*【x+(x+40)】=400
2x+(22-x)=40
(x+40)*80%-x=12
40-x=4(x+5)
40(x+60)=70x
x-40%x=
4(X+5)+X=80 5X+10=3X+4(X+5)+X=80 5X+10=3X+40
x{x+1}{x-1}}x-2}{x-3}-40
60%x+25=40 x+30%x=52 19-120%x=7 4分之3x-5%x=17.5 x-10%x=18 (1-25%)x=36 2x+30%x=9.2
x+60%x=80 80%-30x=305 35%x=210 x+50%x=60 x-40%x=0x+60%x=8080%-30x=30535%x=210x+50%x=60x-40%x=0.36(1-80%)x=21么么哒!