问题 解答题
0.25×2.3×4  
2.68×3.5+6.5×2.68   
12.75÷[14.6-(1.3+8.2)]
3
5
+
1
4
+
3
20
答案

0.25×2.3×4,

=0.25×4×2.3,

=2.3; 

2.68×3.5+6.5×2.68,

=2.68×(3.5+6.5),

=2.68×10,

=26.8;   

12.75÷[14.6-(1.3+8.2)],

=12.75÷(14.6-9.5),

=12.75÷5.1,

=2.5;

3
5
+
1
4
+
3
20

=

12
20
+
5
20
+
3
20

=

20
20

=1.

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