12800×0.8
    640000-128000
    160000×0.8
    1000000×0.2
    20×0.8
    1000000×10%
    17x∧2－32x+15＝0
    4096:2160
    （-3.6）＾2-3.6*2-3
    27761.17= 10549.26+8807.82+ 2992.78+ 2986.07+2160.99+c
    27414.83= 9869.36+9047.98+ 2992.78+ 3003.44+2185.78+c
    z<38%(1.7887*12641.23+0.575342*12641.23-3295.57+1172.39)-(0.009679*12641.23+755.3709+0.391781*12641.23-2197.86+0.057149*12641.23+626.04)
    z>36%(1.7887*12641.23+0.547945*12641.23-3295.57+1172.39)-(-0.030497*12641.23+782.78+0.409589*12641.23-2197.86+0.057149*12641.23+2604+626.04)+2604
    l<(0.4336*12641.23+0.575342*12641.23-3295.57+582.29)/2.20-0.391781*12641.23+2197.86-0.05715*12641.23-209.18
    l>(0.4336*12641.23+0.547945*12641.23-3295.57+582.29)/2.25-0.409589*12641.23+2197.86-0.05715*12641.23-209.18
    （27000-3.88x）÷(25.99x+4.33x)=3.83%
    28031.77= 10652.09+8807.82+ 2992.78+ 2986.07+2153.92+c
    27685.43= 9966.78+9047.98+ 2992.78+ 3003.44+2178.86+c
    z<38%(1.7887*12641.23+0.575342*12641.23-3024.97+1172.39)-(0.009679*12641.23+1054.1609+0.391781*12641.23-2373.65+0.057149*12641.23+626.04)
    z>36%*(1.7887*12641.23+0.547945*12641.23-3024.97+1172.39)-(-0.030655*12641.23+1080.8344+0.409589*12641.23-2373.65+0.057149*12641.23+626.04)

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