问题
解答题
用简便方法计算: (
|
答案
(
+5 12
+1 9
)×72,3 8
=
×72+5 12
×72+1 9
×72;3 8
=30+8+27,
=65;
÷13+8 17
×1 13
,9 17
=
×8 17
+1 13
×1 13
,9 17
=(
+8 17
)×9 17
,1 13
=1×
,1 13
=
.1 13
用简便方法计算: (
|
(
+5 12
+1 9
)×72,3 8
=
×72+5 12
×72+1 9
×72;3 8
=30+8+27,
=65;
÷13+8 17
×1 13
,9 17
=
×8 17
+1 13
×1 13
,9 17
=(
+8 17
)×9 17
,1 13
=1×
,1 13
=
.1 13