（39.402+x）×2.15＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （42.309+x）×1.95＝39.402+71.604-x
    （x-20）/3=2/（x-20-40）
    (39.402+x)×1.95＝39.402+71.604-x
    (39.402+x)×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.95＝39.402+71.604-x
    （39.402+x）×1.75＝39.402+71.604-x
    （39.402+x）×1.55＝39.402+71.604-x
    10.31=14.9x➕4.6（100-x）➗100
    （0.74+57.2）^2+4(0.05+234.4x)^2
    （0.74+57.2）^2+4(0.05+234.4x)^2
    （0.74+57.2）^2+4(0.05+234.4x)^2

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