问题
解答题
我能用简便方法计算.
|
答案
(1)86×
,2 85
=(85+1)×
,2 85
=85×
+1×2 85
,2 85
=2+
,2 85
=2
;2 85
(2)(
+2 3
+3 4
)÷1 6
,1 12
=(
+2 3
+3 4
)×12,1 6
=
×12+2 3
×12+3 4
×12,1 6
=8+9+2,
=19;
(3)
×37.5%+1 2
×4 5
+3 8
÷7 10
,8 3
=
×1 2
+3 8
×4 5
+3 8
×7 10
,3 8
=(
+1 2
+4 5
)×7 10
,3 8
=(
+5 10
+8 10
)×7 10
,3 8
=2×
,3 8
=
.3 4