问题
解答题
脱式计算: 306×15-2080
3.5×(20.6-16.8÷4.8) (
|
答案
(1)306×15-2080
=4590-2080,
=2510;
(2)
-9 10
÷1 3
+2 3 5 6
=
-9 10
+1 2
,5 6
=
;37 30
(3)3.5×(20.6-16.8÷4.8)
=3.5×(20.6-3.5),
=3.5×17.1,
=59.85;
(4)(
+7 9
×2 3
)÷5 6 4 15
=(
+7 9
)÷5 9
,4 15
=
×4 3
,15 4
=5;
(5)
×[7-4÷(4 5
+2 15
)]2 3
=
×[7-4×4 5
],15 12
=
×[7-5],4 5
=
×2,4 5
=
.8 5