问题
解答题
练习简便计算: (1)7.8-(2.8+3
(2)12.35+4
|
答案
(1)7.8-(2.8+3
),5 7
=(7.8-2.8)-3
,5 7
=5-3
,5 7
=1
;2 7
(2)12.35+4
+23.65,7 12
=(12.35+23.65)+4
,7 12
=36+4
,7 12
=40
.7 12
练习简便计算: (1)7.8-(2.8+3
(2)12.35+4
|
(1)7.8-(2.8+3
),5 7
=(7.8-2.8)-3
,5 7
=5-3
,5 7
=1
;2 7
(2)12.35+4
+23.65,7 12
=(12.35+23.65)+4
,7 12
=36+4
,7 12
=40
.7 12