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脱式计算.①14×37+47÷4②3.8×999+3.8③(12+18-16)÷148④44

2022-08-14 02:06:22 问答库 阅读 200 次

问题详情

脱式计算.
1

4

×3

7

+4

7

÷4②3.8×999+3.8③(1

2

+1

8

-1

6

1

48

④444-47+546-53⑤5000-27÷18×106⑥1

2×3

+1

3×4

+…+1

98×99

+1

99×100

参考答案

14×37+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;
12×3+13×4+…+198×99+199×100
=(12-13)+(13-14)+…+(198-199)+(199-1100),
=12-1100
=50100-1100
=49100

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