A-A+

712÷[34-(1112-12)]0.65×6.4-6.5×0.64+65×9%[459-

2022-08-14 03:26:55 问答库 阅读 200 次

问题详情

7

12

÷[3

4

-(11

12

-1

2

)]
0.65×6.4-6.5×0.64+65×9%
[45

9

-(22

5

+0.64)÷31

25

+5

6

]×4.5
1-2+3-4+5-6+…+2009-2010+2011
1

10×13

+1

13×16

+1

16×19

+…+1

34×37


11

2

+21

6

+31

12

+…+91

90

+101

110

参考答案

(1)712÷[34-(1112-12)],
=712÷[34-512],
=712÷13,
=712×3,
=74;

(2)0.65×6.4-6.5×0.64+65×9%,
=0.65×6.4-6.5×0.64+65×0.09,
=0.65×6.4-0.65×6.4+0.65×9,
=0.65×(6.4-6.4+9),
=0.65×9,
=0.65×(10-1),
=6.5-0.65,
=5.85;

(3)[459-(225+0.64)÷3125+56]×4.5,
=[459-(2.4+0.64)÷3.04+56]×4.5,
=[459-3.04÷3.04+56]×4.5,
=[459-1+56]×92,
=[329+56]×92,
=329×92+56×92,
=16+334,
=1934;

(4)1-2+3-4+5-6+…+2009-2010+2011,
=(2011-2010)+(2009-2008)+…+(7-6)+(5-4)+(3-2)+1,
=1+1+…+1,
=1×1005+1,
=1006;

(5)110×13+113×16+116×19+…+134×37,
=13×[(110-113)+(113-116)+(116-119)+…+(134-137)],
=13×[110-137],
=13×27370,
=9370;

(6)112+216+3112+…+9190+101110,
=(1+2+3+…+9+10)+(12+16+112+…+190+1110),
=(1+10)×10÷2+(1-12+12-13+13-14+…+19-110+110-111),
=55+(1-111),
=55+1011,
=551011.

考点: