Xx30X80%=（X-5）X90%×30
    3x^2-14.8x+13.44=0
    (80-10x)(2x+5)=1200
    19x+25（60-x）=1320
    (80-10x)(5x-2)=1200
    (80-10x)(5x+2)=1200
    19x+25（60-x）=1322
    (80-2x)(5x-10)=1200
    0＝-3x^2-14.8x+13.44
    [80-10(x+5)]x=1200
    [80-10(x-5)]x=1200
    30x+20(x+6)=1070
    (80-50)*40+80*25%*(60-x)+x(0.9*(80*125%)-80)=2200
    x^3-73x^2+64=0
    (80-50)*40+(60-x(80*(1+25%)-80))+x(0.9*(80*125%)-80)=2200
    2e(x+2)+xe(x+2)
    x*50+2800=(100-x)*80
    20*x*50+2800=(100-x)*80
    20*200*（1-20%）+10*400*(1-a%)=6000
    (40-x)(500+2X)-500=1950

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