问题
解答题
计算各题,能简便运算的写出主要过程.
|
答案
(1)6.4÷
×8 9
,5 24
=6.4×
×9 8
,5 24
=
;3 2
(2)
×5 42
÷24 25
,36 35
=
×1 21
×12 5
,35 36
=
;1 9
(3)(4-0.4)×(
+2 9
),2 3
=3.6×(
+2 9
),6 9
=3.6×
,8 9
=3.2;
(4)[
-(3 8
+1 6
)]÷1 3
,1 12
=(
-3 8
)×12,1 2
=-
×12,1 8
=-
. 3 2