题目内容

下面各题,怎样算简便就怎样算.
1485+290÷58×1634.25-1.72-2(2.8+3.85÷3.5)×4.6
24×
1
5
+76÷5
(
2
3
-
2
5
)÷(
1
8
+
5
12
)
30÷[(
1
4
+
2
7
7
20
]
(1)1485+290÷58×16,
=1485+5×16,
=1485+80,
=1565;
(2)34.25-1.72-2,
=32.53-2,
=30.53;
(3)(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94;
(4)24×
1
5
+76÷5,
=24×
1
5
+76×
1
5

=(24+76)×
1
5

=100×
1
5

=20;
(5)(
2
3
-
2
5
)÷(
1
8
+
5
12
)

=
4
15
÷
13
24

=
4
15
×
24
13

=
32
65

(6)30÷[(
1
4
+
2
7
)×
7
20
]
=30÷[
15
28
×
7
20
],
=30÷
3
16

=160.
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