问题
解答题
用简便方法计算. 24×
46×
|
答案
(1)24×
×2 7
×215 72
=21×
×24×2 7
,5 72
=6×
,5 3
=10;
(2)
÷7+8 13
×1 7 6 13
=
×8 13
+1 7
×1 7
,6 13
=(
+8 13
)×6 13
,1 7
=
×14 13
,1 7
=
;2 13
(3)46×7 45
=(45+1)×
,7 45
=45×
+1×7 45
,7 45
=7+
,7 45
=7
;7 45
(4)11.58-(7
+1.58)5 11
=11.58-1.58-7
,5 11
=10-7
,5 11
=2
.6 11