问题
解答题
|
答案
(1)24×
×2 7
×215 72
=(24×
)×(5 72
×21)2 7
=
×65 3
=10;
(2)17×
+17÷11 23 23 12
=17×
+17×11 23 12 23
=17×(
+11 23
)12 23
=17×1
=17;
(3)
×3 5
+2 3
÷12 5 1 2
=
×3 5
+2 3
×2 5 2 3
=(
+3 5
)×2 5 2 3
=1×2 3
=
;2 3
(4)
×863 85
=
×(85+1)3 85
=
×85+3 85 3 85
=3+3 85
=3
.3 85