（26.493+x）×2.35＝52.985+71.778-x
    （26.493+x）×2.55＝52.985+71.778-x
    （26.493+x）×2.75＝52.985+71.778-x
    （26.493+x）×2.95＝52.985+71.778-x
    （26.493+x）×3.15＝52.985+71.778-x
    （26.493+x）×3.15＝52.985+71.278-x
    （26.493+x）×2.95＝52.985+71.278-x
    （26.493+x）×2.75＝52.985+71.278-x
    （26.493+x）×2.55＝52.985+71.278-x
    （26.493+x）×2.35＝52.985+71.278-x
    （26.493+x）×2.35＝52.985+71.278+x
    5m-（20-m）=70
    5m（20-m）=70
    5m*（20-m）=70
    5/6x+x∧2=1
    4X×X+25X×X×X×X=0.04
    0.8*(1+x)/10+x=10.8%
    0.8*(1+x)/10+x=10.8
    (2m)*(2m)+(2m+4)*(2m+4)=(2m+sqrt(8m+16))*(2m+sqrt(8m+16))
    25y*y-104y+160=0

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