71900/(0.9×0.598×300)+52000/(0.8×0.76×300)
    (40-6*2)÷2+6*2
    50×(34×4)×3 16800÷15 422100÷21 178×99+178 32040÷40 79×42+79+79×57 21500÷25÷5 7300÷25÷4
    32×(25+125) 75×96+4×75 88×125 83×102－83×2 102×76 98×199 58×98 123×18－123×3+85×123
    4000*（1.02^10+1.02^9+1.02^8+1.02^7+1.02^6+1.02^5+1.02^4+1.02^3+1.02^2+1.02+1）
    23.866/8×〖15.60〗^2
    22.822/8×〖15.60〗^2
    39×1.2×1
    23.866/2×15.60/4×(15.60-15.60/4)
    22.822/2×15.60/4×(15.60-15.60/4)
    (55.2×1×1×1000)/(3.14×9^2 )
    23.866/2×(15.60-2×15.60/4)
    (55.2×1000^4)/(100×210000×1983000×2)
    22.822/2×(15.60-2×15.60/4)
    (6.9×10^6)/(39660×2)
    497－299 125×25×8 2370+1995 (24×125)×(25×8) 3999+498 (12+24+80)×50 402×25 84×36+64×84
    (11.04×1000^4)/(100×11×10^3×0.83×10^7 )
    2214+638+286 256+228+344+212 3065－738－1065 1999+644 1883－398 2357－183－317－357 2365－1086－214 35×24
    (5.52×10^3×1.25×10^5)/(0.83×10^7×100)
    1/8×11.04×1^2

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