21×b×0.65 =8.75
    （a-16.5）÷a = 0.2
    （a-11.8）÷a = 0.2
    （a-7）÷a = 0.2
    13.5×a×0.65=5.29
    13.5×a×0.6=5.29
    13.5×a×0.6+3=5.29
    13.5×a×0.65+3=5.29
    x-32=3/4x+9
    13.5×a+3=5.29
    （a-4.5）÷a = 0.15
    13.5×0.67×0.65+3 = a
    10（1+x）^2=12.1
    11.7×b×0.65+3 = 8.1
    10（1+x）=12.1
    5x^3+14x^2+11x=1
    11.7×b×0.65 = 8.1
    28800x1.2
    0.5x^2-1.5x-2=2
    4x^3+11x^2+8x=2

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