（432.4498355-x-22.47705822)*(481.4165558-324.7740359)=(x*2869.20633+22.47705822*503.666337-x*346.368116-22.47705822*346.368116)
    n×n-2n=-100
    n
    32.7×a×0.65-3=13.6
    20.7×a×0.65-3=8.6
    10.7×a×0.65-3=4.6
    11.7×a×0.65-3=4.6
    7.8×a×0.65-3=4.6
    11.7×a×0.65-3=4.6
    4*70%+30%x=11.5
    x²＋5x＝1
    （a-16.9）÷a=0.2
    （a-13.9）÷a=0.2
    （a-10.9）÷a=0.2
    x^2+3410x-2160000
    x²－2520x+13444.2＝0
    0.13x+x=138000
    （a-6.9）÷a=0.2
    sinx^2+cosx^2=1
    18×（6+x)+8x=576

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