问题
解答题
用简便方法计算 (1)[45-(
(2)-
|
答案
(1)[45-(
-7 9
+11 12
)×36]÷5,5 6
=[45-
×36-(-7 9
)×36-11 12
×36]÷5,5 6
=(45-28+33-30)÷5,
=(78-58)÷5,
=20÷5,
=4;
(2)-
×(-92)+(-2 9
)×342 9
+3 5
×232 9
,3 5
=
×92-2 9
×342 9
+3 5
×232 9
,3 5
=
×(92-342 9
+233 5
),3 5
=
×(92-11),2 9
=
×81,2 9
=18.