题目内容

用简便方法计算
(1)[45-(
7
9
-
11
12
+
5
6
)×36]÷5

(2)-
2
9
×(-92)+(-
2
9
)×34
3
5
+
2
9
×23
3
5
(1)[45-(
7
9
-
11
12
+
5
6
)×36]÷5,
=[45-
7
9
×36-(-
11
12
)×36-
5
6
×36]÷5,
=(45-28+33-30)÷5,
=(78-58)÷5,
=20÷5,
=4;

(2)-
2
9
×(-92)+(-
2
9
)×34
3
5
+
2
9
×23
3
5

=
2
9
×92-
2
9
×34
3
5
+
2
9
×23
3
5

=
2
9
×(92-34
3
5
+23
3
5
),
=
2
9
×(92-11),
=
2
9
×81,
=18.
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