问题
解答题
能简算的要简算
|
答案
(1)(
-2 3
)×1 2
÷3 5
,9 10
=(
-4 6
)×3 6
×3 5
,10 9
=
×1 6
×3 5
,10 9
=
;1 9
(2)
×11 12
+1 6
×5 6
,11 12
=
×(11 12
+1 6
),5 6
=
×1,11 12
=
;11 12
(3)40%×
+0.45×70%-45%×0.1,9 20
=40%×0.45+0.45×70%-0.45×0.1,
=0.45×(40%+70%-0.1),
=0.45×(1.1-0.1),
=0.45.