问题 解答题
脱式计算.
2220-36×42÷27[(1
1
2
+2
2
3
)÷2
1
2
-
5
6
]×4
4
5
(25%+
3
8
)×(
3
7
÷
3
7
÷
5
8
答案

(1)2220-36×42÷27,

=2220-1512÷27,

=2220-56,

=2164;

(2)[(1

1
2
+2
2
3
)÷2
1
2
-
5
6
]×4
4
5

=[

25
6
÷2
1
2
-
5
6
]×4
4
5

=[

5
3
-
5
6
]×4
4
5

=

5
6
×
24
5

=4;

(3)(25%+

3
8
)×(
3
7
÷
3
7
÷
5
8
),

=

5
8
×(1÷
5
8
),

=

5
8
×
8
5

=1.

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