问题
解答题
|
答案
(1)4.8÷1.2-0.15,
=4-0.15,
=3.85;
(2)2÷
-2 3
÷2,2 3
=2×
-3 2
×2 3
,1 2
=3-
,1 3
=2
;2 3
(3)
×(3 10
-5 7
),10 21
=
×3 10
-5 7
×3 10
,10 21
=
-3 14
,1 7
=
;1 14
(4)1÷(
+3 5
)×1 4
,17 19
=1÷
×17 20
,17 19
=
×20 17
,17 19
=
.20 19