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计算.208-900÷45 25.6-8.44-1.56 0.8×40×25×1.25 [1-(12-14)]×23 (1115-95÷3)÷715.

编辑:chaxungu时间:2026-04-27 13:18:19分类:小学数学题库

计算.
208-900÷45
25.6-8.44-1.560.8×40×25×1.25
[1-(
1
2
-
1
4
)]×
2
3
(
11
15
-
9
5
÷3)÷
7
15
.
(1)208-900÷45,
=208-20,
=188;

(2)25.6-8.44-1.56,
=25.6-(8.44+1.56),
=25.6-10,
=15.6;

(3)0.8×40×25×1.25,
=(0.8×1.25)×(40×25),
=1×1000,
=1000;

(4)[1-(
1
2
-
1
4
)]×
2
3
,
=[1-
1
4
]×
2
3
,
=
3
4
×
2
3
,
=
1
2
;

(5)(
11
15
-
9
5
÷3)÷
7
15
,
=(
11
15
-
9
15
)÷
7
15
,
=
2
15
÷
7
15
,
=
2
7
.