问题
解答题
|
答案
(1)3.2×0.25-
÷4,4 7
=
×16 5
-1 4
×4 7
,1 4
=
-4 5
,1 7
=
;23 35
(2)0.4×(3.85-0.4)÷13.8,
=0.4×3.45÷13.8,
=1.38÷13.8,
=0.1;
(3)15.8-
+14.2-7 18
,11 18
=(15.8+14.2)-(
+7 18
),11 18
=30-1,
=29;
(4)8×(
+3 8
)+1 27
,19 27
=8×
+3 8
×8+1 27
,19 27
=3+(
+8 27
),19 27
=3+1,
=4;
(5)
÷(13 18
+5 6
×2 3
),3 8
=
÷(13 18
+5 6
),1 4
=
÷13 18
,13 12
=
×13 18
,12 13
=
;2 3
(6)68÷[0.5×(7.5-0.7)],
=68÷[0.5×6.8],
=68÷3.4,
=20.