问题
解答题
计算下面各题,怎样算简便就怎样算.
|
答案
(1)15×
÷3 8 9 4
=15×
×3 8 4 9
=2
;1 2
(2)30×(
+2 5
-1 6
)4 15
=30×
+30×2 5
-30×1 6 4 15
=12+5-8
=9;
(3)
×2 5
+40%×7 13 6 13
=
×2 5
+7 13
×2 5 6 13
=
×(2 5
+7 13
)6 13
=
×12 5
=
;2 5
(4)10-(
+2 5
×2)3 5
=10-(
+2 5
)6 5
=10-13 5
=8
;2 5
(5)
+7 15
×1 4
-12 5 3 5
=
+7 15
-3 5 3 5
=
;7 15
(6)[(
-1)÷7 5
]×2 5 5 4
=[
÷2 5
]×2 5 5 4
=1×5 4
=1
.1 4