问题
解答题
|
答案
(1)
+1 6
+2 9
+5 6
,5 9
=(
+1 6
)+(5 6
+5 9
),2 9
=1+
,7 9
=1
;7 9
(2)15.6÷
+44 9
×2.25,2 5
=15.6×
+4.4×2.25,9 4
=15.6×2.25+4.4×2.25,
=(15.6+4.4)×2.25,
=20×2.25,
=45.
|
(1)
+1 6
+2 9
+5 6
,5 9
=(
+1 6
)+(5 6
+5 9
),2 9
=1+
,7 9
=1
;7 9
(2)15.6÷
+44 9
×2.25,2 5
=15.6×
+4.4×2.25,9 4
=15.6×2.25+4.4×2.25,
=(15.6+4.4)×2.25,
=20×2.25,
=45.