（m-70）（-2m+240）＝1200
     cot 45
    5X2-18=9X
    （x+3.5）×8.97=12.24x
    33.9×7.62+12.24x=（33.9+x）×8.97
    9/8-x=5/8+1/6
    9792x∧2-25200x+90000
    3x*x-27x-100=0
    3x*x-27x+100=0
    (20-x)*(32-2x)=540
    -8/150=x/100
    ((0.8+0.8g)/10)+g=10.8%
    5-(x-1.5)²=x²-2.25
    -2x²+9.5-3x=0
    x=－xsin45－cos45
    x=cosx
    175=10x+5x²
    -175=10x+5x*x
    175=10x-5x²
    10x-5x*x=175

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