问题
解答题
|
答案
(1)
÷9+7 12
×1 9
,5 12
=
×7 12
+1 9
×1 9
,5 12
=(
+7 12
)×5 12
,1 9
=1×
,1 9
=
;1 9
(2)[
-0÷(4 5
+1 3
)]×2 5
,5 8
=
×4 5
,5 8
=
;1 2
(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;
(4)2÷
-2 3
÷2,2 3
=3-
,1 3
=2
;2 3
(5)(
+1 15
)×15×17,2 17
=
×15×17+1 15
×15×17,2 17
=17+30,
=47;
(6)(15-15×
)×4 5
,7 24
=(15-12)×
,7 24
=3×
,7 24
=
.7 8