问题
解答题
|
答案
(1)
×9 14
÷3 8
,3 14
=
×9 14
×3 8
,14 3
=1
;1 8
(2)
×2 9
+3 5
×4 9
,3 5
=(
+2 9
)×4 9
,3 5
=
×2 3
,3 5
=
;2 5
(3)2.8×(
+1 7
),3 28
=2.8×
+1 7
×2.8,3 28
=0.4+0.3,
=0.7;
(4)(
-1 2
÷1 4
)×5 8
,5 7
=(
-1 2
)×2 5
,5 7
=
×1 10
,5 7
=
;1 14
(5)
×19 4
+1 5
÷19 4
+5 4
,19 4
=
×19 4
+1 5
×19 4
+4 5
,19 4
=
×(19 4
+1 5
+1),4 5
=9.5.