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能简算的用简便方法计算.(1)72×58-32÷85(2)45÷[(35+12)×2](3)825×99+825.
题目详情
能简算的用简便方法计算.
(1)
×
-
÷
(2)
÷[(
+
)×2]
(3)
×99+
.
(1)
7 |
2 |
5 |
8 |
3 |
2 |
8 |
5 |
(2)
4 |
5 |
3 |
5 |
1 |
2 |
(3)
8 |
25 |
8 |
25 |
▼优质解答
答案和解析
(1)
×
-
÷
=
×
-
×
=(
-
)×
=2×
=
;
(2)
÷[(
+
)×2]
=
÷[
×2]
=
÷
=
;
(3)
×99+
=
×(99+1)
=
×100
=32.
7 |
2 |
5 |
8 |
3 |
2 |
8 |
5 |
=
7 |
2 |
5 |
8 |
3 |
2 |
5 |
8 |
=(
7 |
2 |
3 |
2 |
5 |
8 |
=2×
5 |
8 |
=
5 |
4 |
(2)
4 |
5 |
3 |
5 |
1 |
2 |
=
4 |
5 |
11 |
10 |
=
4 |
5 |
11 |
5 |
=
4 |
11 |
(3)
8 |
25 |
8 |
25 |
=
8 |
25 |
=
8 |
25 |
=32.
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