试题:
下面各题怎样简便就怎样算.
①4×0.8×2.5×12.5
2
13
÷[1-(
1
2
+
1
3
)]

③(2.8+3.85÷3.5)×4.6
(
24
29
+
16
17
1
8
+
15
17

答案:

我来补答
①4×0.8×2.5×12.5;
=(4×2.5)×(0.8×12.5);
=10×10;
=100;

2
13
÷[1-(
1
2
+
1
3
)]

=
2
13
÷(1-
5
6
);
=
2
13
÷
1
6

=
12
13


③(2.8+3.85÷3.5)×4.6;
=(2.8+1.1)×4.6;
=3.9×4.6;
=17.94;

(
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
 
 
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这些题目你会做吗?