120+0.4x=280+0.28x
    X-X/1.05*0.015-X/1.05*0.015*0.7*0.5-(X-X/1.05*0.015)*0.02-(X-X/1.05*0.015)*0.005=27600
    5x^2+2x-3=0
    x-0.02x-x*0.005=27600
    x-x/1.05*0.015-x/1.05*0.015*0.07/2-(x-x/1.05*0.015)*0.02-(x-x/1.05*0.015)*0.005=27600
    x-x*0.02-x*0.005=27600
    27600+x*0.02+x*0.005=x
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=92.320
    （6x-7）:5x=1:2
    （16-8x+x^2）（66-x）=x（33-x）^2
    1.7040291＝x^0.8677
    -1.0960663=ln（x）
    -2.0649646＝ln（x）
    2192.4+1925.6×cos(x)＝1660×sin（x）
    2192.4+1925.6×cos(x)＝8073.576×sin（x）
    800=12x-12×293+4.536×10^(-8)x^4-293^4×4.536×10^(-8)
    2x^3-x^2=1
    3.047=（（26.99*0.829（x+0.1））/（1+0.829（x+0.1））*（（100-7.84-1.06）/100）*（1/(1+0.31*1.06）+（（2.96（x+0.1））/（1.31*0.101325））
    (83+y)÷2×0.7+238÷710×100×0.3=60
    （220*2*63-x）*0.85=21175.45

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