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脱式计算(能算的要简算)5.38-6.72+4.6225×38+35÷85405-2562÷8.4(1112-34)÷(2-12)49÷(79+49)×114120÷[45×(1-89)].

题目详情
脱式计算(能算的要简算)
5.38-6.72+4.62             
2
5
×
3
8
+
3
5
÷
8
5
          
405-2562÷8.4
11
12
-
3
4
)÷(2-
1
2
)         
4
9
÷(
7
9
+
4
9
)×
11
4
         
120÷[45×(1-
8
9
)].
▼优质解答
答案和解析
(1)5.38-6.72+4.62
=5.38+4.62-6.72
=10-6.72
=3.28;

(2)
2
5
×
3
8
+
3
5
÷
8
5

=
3
20
+
3
8

=
21
40


(3)405-2562÷8.4
=405-305
=100;

(4)(
11
12
-
3
4
)÷(2-
1
2

=
1
6
÷1
1
2

=
1
9


(5)
4
9
÷(
7
9
+
4
9
)×
11
4

=
4
9
÷
11
9
×
11
4

=
4
11
×
11
4

=1;

(6)120÷[45×(1-
8
9
)]
=120÷[45×
1
9
]
=120÷5
=24.