问题 解答题
脱式计算.
772-317+128-283
11
12
-
3
4
)÷(2-
1
2
4.6×
11
8
+8.4÷
8
11
-
11
8
×5
(3618÷18-145)×20120÷[45×(1-
8
9
)]
3
5
÷[(
7
9
+
1
3
)×
3
2
].
答案

(1)772-317+128-283,

=772+128-(317+283),

=900-600,

=300,

(2)(

11
12
-
3
4
)÷(2-
1
2
),

=

1
6
×
2
3

=

1
9

(3)4.6×

11
8
+8.4÷
8
11
-
11
8
×5,

=(4.6+8.4-5)×

11
8

=8×

11
8

=11,

(4)(3618÷18-145)×20,

=(201-145)×20,

=56×20,

=1120,

(5)120÷[45×(1-

8
9
)],

=120÷[45×

1
9
],

=120÷5,

=24,

(6)

3
5
÷[(
7
9
+
1
3
)×
3
2
],

=

3
5
÷[
10
9
×
3
2
],

=

3
5
×
3
5

=

9
25

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