a（20-a）=32
    -0.2231x2 - 0.7522x + 26.094=1/(E^16x) + 6.5
    -0.2231x2 - 0.7522x + 26.094=1E-16x + 6.5
    X/111-.2-20/44.7=0.00238(X+135）
    X/111-.2-20/44.7=0.00238(X+120）
    （-2x+1-1）^2
    （-2x+1-1）^2
    3/8x+1/4=x-1/7
    16/(x+2)^2
    28*28=3.8616x+12.091x*x
    ㏑x－3÷x＝1
    ㏑x－3x＝1
    (cosX)^2-2X^2 = 0
    (cosX)^2-4X^2 = 0
    (cosX)^2-X^2 = 0
    (cosX)^2-0.5X^2 = 0
    (cosX)^2-0.5X^2 = 0
    (cosX)^2-4X^2＝0
    0.0197x+8.2528＝-0.2202x^2-0.751x+27.865
    80y-15×（6750-25y）÷120等于550

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