问题 解答题
脱式计算,能简算要简算
33.5-5.3-4.7+16.5        
9900÷25÷4           1÷(
3
5
+
3
10
24×(
2
3
+
1
6
-
3
8
)      
1+0.45÷0.9-
7
8
    
 
20
17
-(
3
17
+
2
3
答案

(1)33.5-5.3-4.7+16.5,

=(33.5+16.5)-(5.3+4.7),

=50-10,

=40;

(2)9900÷25÷4,

=9900÷(25×4),

=9900÷100,

=99;

(3)1÷(

3
5
+
3
10
),

=1÷

9
10

=

10
9

(4)24×(

2
3
+
1
6
-
3
8
),

=24×

2
3
+24×
1
6
-24×
3
8

=16+4-9,

=20-9,

=11;

(5)1+0.45÷0.9-

7
8

=1+0.5-

7
8

=1.5-

7
8

=0.625;

(6)

20
17
-(
3
17
+
2
3
),

=

20
17
-
3
17
-
2
3

=1-

2
3

=

1
3

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