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脱式计算999+99+9+3[6.85-(0.65+0.7)]÷2.5(43-34)÷(56×74)(57+313)×7-2113.

题目详情
脱式计算
999+99+9+3
[6.85-(0.65+0.7)]÷2.5
4
3
-
3
4
)÷(
5
6
×
7
4

5
7
+
3
13
)×7-
21
13
▼优质解答
答案和解析
(1)999+99+9+3
=(999+1)+(99+1)+(9+1)
=1000+100+10
=1110;
(2)[6.85-(0.65+0.7)]÷2.5
=[6.85-1.35]÷2.5
=5.5÷2.5
=2.2;
(3)(
4
3
-
3
4
)÷(
5
6
×
7
4

=
7
12
÷
35
24

=
2
5

(4)(
5
7
+
3
13
)×7-
21
13

=
5
7
×7+
3
13
×7-
21
13

=5+(
21
13
-
21
13

=5+0
=5.