问题
解答题
用简便方法计算下面各题.
|
答案
(1)
×2 7
+4 5
×5 7 4 5
=(
+2 7
)×5 7 4 5
=1×4 5
=
;4 5
(2)
×7+11÷5 9 9 5
=
×7+11×5 9 5 9
=
×(7+11)5 9
=
×185 9
=10;
(3)
÷7+8 13
×1 7 5 13
=
×8 13
+1 7
×1 7 5 13
=(
+8 13
)×5 13 1 7
=1×1 7
=
;1 7
(4)15×
-6 7 6 7
=(15-1)×6 7
=14×6 7
=12.