题目内容

下面各题怎样简便就怎样算.
(
24
29
+
16
17
1
8
+
15
17

2
13
÷[1-(
1
2
+
1
3
)]
4×0.8×2.5×12.5                   
(2.8+3.85÷3.5)×4.6.
(1)(
24
29
+
16
17
)×
1
8
+
15
17

=
24
29
×
1
8
+
16
17
×
1
8
+
15
17

=
3
29
+
2
17
+
15
17

=
3
29
+(
2
17
+
15
17
),
=
3
29
+1,
=1
3
29


(2)
2
13
÷[1-(
1
2
+
1
3
)],
=
2
13
÷[1-
5
6
],
=
2
13
÷
1
6

=
12
13



(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;

(4)(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.
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