问题 解答题
脱式计算,能简算的要简算
3
4
11
+3
3
7
+6
7
11
47×2.8+52×2.8+2.8
37.6-4.87-1.1331-[0.5×(6-5.7)+18]
9.3÷[24×(1-
3
8
)+3.6]
[(
3
2
+
8
3
5
6
-
7
3
8
9
答案

(1)3

4
11
+3
3
7
+6
7
11

=3

4
11
+6
7
11
+3
3
7

=10+3

3
7

=13

3
7

(2)47×2.8+52×2.8+2.8

=2.8×(47+52+1)

=2.8×100

=280;

(3)37.6-4.87-1.13

=37.6-(4.87+1.13)

=37.6-6

=31.6;

(4)31-[0.5×(6-5.7)+18]

=31-[0.5×0.3+18]

=31-18.15

=12.85;

(5)9.3÷[24×(1-

3
8
)+3.6]

=9.3÷[24×1-24×

3
8
+3.6]

=9.3÷18.6

=0.5;

(6)[(

3
2
+
8
3
)÷
5
6
-
7
3
8
9

=[

25
6
÷
5
6
-
7
3
8
9

=[

25
6
÷
5
6
-
7
3
8
9

=[5-

7
3
8
9

=

8
3
÷
8
9

=3;

故答案为13

3
7
;280;31.6;12.85;0.5;3.

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单项选择题