问题
解答题
计算下面各题.(能够简便计算的要求简便计算) ①730-240÷15×16 ②
③
④[1一(
|
答案
①730-240÷15×16,
=730-16×16,
=730-256,
=474;
②
×7 9
+5 11
×2 9
,5 11
=(
+7 9
)×2 9
,5 11
=1×
,5 11
=
;5 11
③
+3 4
×3,3 4
=
×(1+3),3 4
=
×4,3 4
=3;
④[1一(
-1 2
)]×1 4
,2 3
=[1-
]×1 4
,2 3
=
×3 4
,2 3
=
.1 2