问题 解答题
计算:
(1)20
5
23
-2.73-8.27+1
7
13

(2)
5
9
×
7
5
12
+
1
9
×
1
7
12
×5
(3)[(88+
8
9
)×1.125-54]÷23%
(4)[2
4
9
÷(3
2
5
-
11
15
)×1
1
11
]÷4.02.
答案

(1)20

5
23
-2.73-8.27+1
7
13

=(20

5
23
+1
7
13
)-(2.73+8.27),

=21

226
299
-11,

=10

226
299

(2)

5
9
×7
5
12
+
1
9
×
1
7
12
×5,

=

5
9
×7
5
12
+
5
9
×1
7
12

=(7

5
12
+1
7
12
)×
5
9

=9×

5
9

=5;

(3)[(88+

8
9
)×1.125-54]÷23%,

=[(88+

8
9
)×1
1
8
-54]÷23%,

=[(88×

9
8
+
8
9
×
9
8
)-54]÷23%,

=[99+1-54]÷0.23,

=46÷0.23,

=200;

(4)[2

4
9
÷(3
2
5
-
11
15
)×1
1
11
]÷4.02,

=[

22
9
÷2
2
3
×1
1
11
]÷4.02,

=[

22
9
×
3
8
×
12
11
]÷4.02,

=1÷4.02,

=100÷402,

=

50
201

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