问题
解答题
计算下面各题.(能简算的要用简便方法算) 60×(
1-[
|
答案
(1)60×(
+2 5
-3 4
)1 2
=60×
+60×2 5
-60×3 4 1 2
=24+45-30
=39
(2)1-[
+(1 6
-3 4
)]7 12
=1-[
+1 6
]1 6
=1-1 3
=2 3
(3)
×5 8
+11 10
÷3 8 10 11
=
×5 8
+11 10
×3 8 11 10
=(
+5 8
)×3 8 11 10
=1×11 10
=11 10