问题 解答题
计算.(能简算的要简算)
1375+450÷18×25   18÷1.5-0.2×0.7    24×(
1
4
+
1
8
-
1
3

13
25
×17+8÷
25
13
     20.21-3.55-6.45    
4
5
×[12÷(
3
8
+
1
8
)].
答案

1375+450÷18×25,

=1375+25×25,

=1375+625,

=2000;

18÷1.5-0.2×0.7,

=12-0.14,

=11.86;

24×(

1
4
+
1
8
-
1
3
),

=24×

1
4
+24×
1
8
-24×
1
3

=6+3-8,

=1;

13
25
×17+8÷
25
13

=

13
25
×17+8×
13
25

=

13
25
×(17+8),

=

13
25
×25,

=13;

20.21-3.55-6.45,

=20.21-(3.55+6.45),

=20.21-10,

=10.21;

4
5
×[12÷(
3
8
+
1
8
)]

=

4
5
×(12÷
1
2
),

=

4
5
×24,

=

96
5

=19.2.

单项选择题
单项选择题