163.8+281.34-0.6×27-0.48×19
    (6.3-0.48-0.48)×24+(6.3-0.48-0.12)×3+ (1.56+2.4)×18+3.66+3.9+3.36+(60-0.48×2-0.6×14)+(40.5-0.48×2-0.6×9)+(15.6-0.3-0.48-3×0.6)
    (27.9-0.48-0.3-0.6×6)+(4.2-0.3-0.48)+(15.6-0.3-0.48-3×0.6)
    (6.3-0.48-0.48)×23+(6.3-0.48-0.12)×3+(1.56+2.4)×9+3.66+3.9+(1.86+2.4)×1+3.36+(60-0.48×2-0.6×14)
    2967.580627×30%
    2967.580627×70%
    2.1×(18.84+0.3×2+0.67×2.1)×(63.06+0.3×2+0.67×2.1)+2.1×(7.48+0.3×2+0.67×2.1)×3+2.1×(7.18+0.3×2+0.67×2.1)×3
     2.1×(18.84+0.3×2+0.67×2.1) ×(63.06+0.3×2+0.67×2.1)+ 2.1×(7.48+0.3×2+0.67×2.1) ×3
    [2.1×(18.84+0.3×2+0.67×2.1) ×(63.06+0.3×2+0.67×2.1)+ 2.1×(7.48+0.3×2+0.67×2.1) ×3+1/3×0.672×2.13]
    1234/100
    123/10
    1234/10
    123/10
    91.81128×2.1/0.1
    945.8712+2×164.76+16
    1.2×1.5×1+1.8×2.1×3
    1.8×2.1×1
    0.9×2.1×21+1.8×2.1×6+1.2×2.1×2+0.7×2.1×18
    1.2×1.5×44+0.7×2.1×19+0.7×1.5×1+1.5×1.5×2
    0.9×2.1×21+1.8×2.1×6+1.2×2.1×2+0.7×2.1×18

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