9999×7+1111×3748×1.08+1.2×56.818×7/5-5×7/42.5×2.85+0.25÷2/23

6个回答

  • 9999×7+1111×37

    =1111×9×7+1111×37

    =1111×63+1111×37

    =1111×(63+37)

    =1111×100

    =111100

    48×1.08+1.2×56.8

    =12×4×1.08+12×5.68

    =12×4.32+12×5.68

    =12×(4.32+5.68)

    =12×10

    =120

    18×7/5-5×7/4

    =7×18/5-7×5/4

    =7×(18/5-5/4)

    =7×47/20

    =329/20

    2.5×2.85+0.25÷2/23

    =2.5×2.85+0.25×11.5

    =2.5×2.85+2.5×1.15

    =2.5×(2.85+1.15)

    =2.5×4

    =10