问题
解答题
能简便的要用简便计算
|
答案
(1)
-7 8
×5 8 4 5
=
-7 8
,4 8
=
;3 8
(2)
×7 24
×6 13
×813 3
=
×8×(7 24
×6 13
),13 3
=
×2,7 3
=
;14 3
(3)101×19 25
=(100+1)×
,19 25
=100×
+19 25
,19 25
=76+
,19 25
=76
;19 25
(4)72×(
+7 9
)5 8
=72×
+72×7 9
,5 8
=56+45,
=101;
(5)73×
-7 36 7 36
=(73-1)×
,7 36
=72×
,7 36
=14;
(6)57×
+12 29 12 29
=(57+1)×
,12 29
=58×
,12 29
=24.