(4-X)/4=0.4
    （1500－x）/4=x－150
    276-6x=2000-10x
    B*B+B=306
    x+0.4=1.8*x
    x^2=（0.05-x）0.0000001
    0.72*x*2.02*2.41=3.66
    2100×1000000=13.8×1600x(1200-x/2)
    2100×1000000=13.8×1600x(1400-x/2)
    x^2-3x+2-e^x
    100＝102／(1+r)²
    x-1390/x=0.37
    3x-17=4x-9
    xe^x
    ex=x
    expx=x
    -10x²+1400x-40000
    2x+8=4
    2x*8=4
    2x*6=4

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