问题
解答题
计算下面各题(能简算的要简算): ①
②(
③36×[(
④
|
答案
①
×9+19 14
×19,19 14
=
×(9+19),19 14
=
×28,19 14
=38;
②(
-1 2
)÷1 3
+2 5
,2 3
=
÷1 6
+2 5
,2 3
=
+5 12
,2 3
=
;13 12
③36×[(
-5 6
)÷3],1 3
=36×[
÷3],1 2
=36×
;1 6
=6;
④
÷[(9 4
-7 3
)×6 5
],3 4
=
÷[9 4
×17 15
],3 4
=
÷9 4
,17 20
=
.45 17