X - 0.25X -(0.25X - 5) = 20列式在四十分钟内回答追分

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（x-4)-(x+4)=0.25x 66=X+0.25X求X 0.25x+3.6=x解x 0.25x x-0.25=0.25x x-0.25x+1=10.4x+0.25x-1 {x+10}x{x+10}=0.25x x-0.25x=0. X-0.25x=0. x-0.25x=48 x-35%x=0.25 x-1.75x=0.25 x-0.25x=15 X-0.25x=0. x-0.25x=2.4 (x-3.6)/x=0.25 x-12=0.25x 12.5-0.25X=X