问题
解答题
怎样简便就怎样算.
24×
69×
|
答案
(1)
×37-7 18
,7 18
=
×(37-1),7 18
=
×36,7 18
=14;
(2)
×37+73×11 13
-19×11 13
,11 13
=
×(37+73-19),11 13
=
×91,11 13
=77;
(3)24×
+51×51 43
,19 43
=24×
+51 43
×19,51 43
=(24+19)×
,51 43
=43×
,51 43
=51;
(4)69×
-13×13 54
,15 54
=23×
-5×13 18
,13 18
=(23-5)×
,13 18
=18×
,13 18
=13.