问题
解答题
用简便方法计算: 24×
|
答案
①24×
×2 7
×215 72
=(24×
)×(5 72
×21)2 7
=
×65 3
=10;
②17×
+17÷11 23 23 12
=17×
+17×11 23 12 23
=17×(
+11 23
)12 23
=17×1
=17.
用简便方法计算: 24×
|
①24×
×2 7
×215 72
=(24×
)×(5 72
×21)2 7
=
×65 3
=10;
②17×
+17÷11 23 23 12
=17×
+17×11 23 12 23
=17×(
+11 23
)12 23
=17×1
=17.