问题
解答题
脱式计算:(能简算的要简算)
8.6×2
|
答案
(1)
×6 15
+1 7
÷7,8 15
=
×6 15
+1 7
×8 15
,1 7
=(
+6 15
)×8 15
,1 7
=
×14 15
,1 7
=
;2 15
(2)
÷[9 10
×(1 2
-6 5
)],3 10
=
÷[9 10
×1 2
],9 10
=
÷9 10
,9 20
=2;
(3)8.6×2
-0.6÷3 4
,4 11
=8.6×
-0.6×11 4
,11 4
=(8.6-0.6)×
,11 4
=8×
,11 4
=22.