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脱式计算.①14×37+47÷4②3.8×999+3.8③(12+18-16)÷148④44
问题详情
①
参考答案
①14×37+47÷4,
=14×37+47×14,
=(37+47)×14,
=1×14,
=14;
②3.8×999+3.8,
=(999+1)×3.8,
=1000×3.8,
=3800;
③(12+18-16)÷148,
=(12+18-16)×48,
=12×48+18×48-16×48,
=24+6-8,
=22;
④444-47+546-53,
=(444+546)-(47+53),
=990-100,
=890;
⑤5000-27÷18×106,
=5000-2718×106,
=5000-159,
=4841;
⑥12×3+13×4+…+198×99+199×100,
=(12-13)+(13-14)+…+(198-199)+(199-1100),
=12-1100,
=50100-1100,
=49100.
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