0.25×X=40

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0.25×X=40 x-40%x= （x-4)-(x+4)=0.25x 66=X+0.25X求X 0.25x+3.6=x解x x-40%x-40%x=15 x+40=2x x=? X×X+(40-X)=58 X乘以X等于40 ---------------------X=? 10x+x*x=40 (x+40%x)×85%-x=95 (x+40%x)×85%-x=95 4x+x=40x 40%x+70%x-x=1.8 x-0.25=0.25x x-0.25x+1=10.4x+0.25x-1 x-0.25x=0. X-0.25x=0.