问题
解答题
下面各题,怎样算简便就怎样算.
|
答案
(1)9-
÷9,9 20
=9-0.05,
=8.95;
(2)
×7 12
×3 7
,5 6
=
×1 4
,5 6
=
;5 24
(3)2.4-2.4×
-4 7
,3 7
=2.4×(1-
)-4 7
,3 7
=(2.4-1)×
,3 7
=0.6;
(4)
÷4 9
+2 5
÷5 9
,2 5
=(
+4 9
)×5 9
,5 2
=
;5 2
(5)3×(
+2 15
)-1 12
,2 5
=3×
+3×2 15
-1 12
,2 5
=
+2 5
-1 4
,2 5
=
;1 4
(6)
÷[(1 5
+2 3
)×1 5
],1 15
=
÷【1 5
×13 15
】,1 15
=
×1 5
,15×15 13
=
.45 13