问题
解答题
|
答案
(1)48.9-12.7-0.3,
=48.9-(12.7+0.3),
=48.9-13,
=35.9;
(2)56.4-39.7+24.3,
=16.7+24.3,
=41;
(3)404+26×9,
=404+234,
=638;
(4)3.5×2.8-4.7,
=9.8-4.7,
=5.1;
(5)18.2+38.4÷4.8,
=18.2+8,
=26.2;
(6)
+1 4
-5 8
,1 2
=
+2 8
-5 8
,4 8
=
;3 8
(7)
-4 3
+3 4 1 6
=
-16 12
+9 12
,2 12
=
;3 4
(8)
×9 13
+3 8
×5 8
,9 13
=
×(9 13
+3 8
),5 8
=
×1,9 13
=
;9 13
(9)
×9 4
-2 3
,2 3
=
-3 2
,2 3
=
-9 6
,4 6
=
;5 6
(10)
÷9 16
+3 8
,1 4
=
+3 2
,1 4
=1
;3 4
(11)(
+1 4
)÷1 5
-9 10
,1 7
=
×9 20
-10 9
,1 7
=
-1 2
,1 7
=
;5 14
(12)
+4 15
×(2 5
-5 6
),2 3
=
+4 15
×2 5
,1 6
=
+4 15
,1 15
=
.1 3