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计算下面各题,怎样简便就怎样计算.884÷34+17×211.25×3.2×0.25(45+14)÷73+3104÷5+39×454.2-1.38+5.8-4.622÷25-25

题目详情
计算下面各题,怎样简便就怎样计算.
884÷34+17×21

1.25×3.2×0.25

4
5
+
1
4
)÷
7
3
+
3
10
4÷5+39×
4
5
4.2-1.38+5.8-4.62
2
5
-
2
5
÷2.
▼优质解答
答案和解析
(1)884÷34+17×21,
=26+357,
=383;

(2)1.25×3.2×0.25,
=1.25×(0.8×4)×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;

(3)(
4
5
+
1
4
)÷
7
3
+
3
10

=
21
20
÷
7
3
+
3
10

=
9
20
+
3
10

=
3
4


(4)4÷5+39×
4
5

=
4
5
+39×
4
5

=
4
5
×(1+39),
=
4
5
×40,
=32;

(5)4.2-1.38+5.8-4.62,
=(4.2+5.8)-(1.38+4.62),
=10-6,
=4;

(6)2÷
2
5
-
2
5
÷2,
=5-
1
5

=4
4
5