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计算:(要求写出计算过程)(1)5114×45+6115×56+7116×67(2)1-12

2022-08-14 02:19:19 问答库 阅读 200 次

问题详情

计算:(要求写出计算过程)
(1)511

4

×4

5

+611

5

×5

6

+711

6

×6

7


(2)1-1

2

×{1-1

3

×[1-1

4

×(1-1

5

)]}

(3)[1-(1

12

+1

15

)×4]÷(3

10

÷9

25

)

(4)2008×11

2

÷11

3

-1002

5

÷1

20

参考答案

(1)5114×45+6115×56+7116×67
=(50+54)×45+(60+65)×56+(70+76)×67
=(40+1)+(50+1)+(60+1),
=150+3,
=153;

(2)1-12×{1-13×[1-14×(1-15)]},
=1-12×{1-13×[1-14×45]},
=1-12×{1-13×[1-15]},
=1-12×{1-13×45},
=1-12×{1-415},
=1-12×1115
=1-1130
=1930

(3)[1-(112+115)×4]÷(310÷925),
=[1-320×4]÷(310×259),
=[1-3556
=25×65
=1225

(4)2008×112÷113-10025÷120
=2008×32×34-5025×20,
=2008×32×34-2008,
=2008×(32×34-1)
=2008×18
=251.

考点:过程