问题 解答题
用递等式计算:
(1)1
1
3
×[21÷(4
1
12
-2.625)-4
1
2
]÷3
3
5


(2)(2
5
8
-1
4
7
)÷[(3
1
12
+4.375)÷19
8
9
]


(3)
10
13
÷2
19
22
-1.4×
11
13
+7+
22
63
×20%
答案

(1)1

1
3
×[21÷(4
1
12
-2.625)-4
1
2
]÷3
3
5

=1

1
3
×[21÷
35
24
-4
1
2
]÷3
3
5

=1

1
3
×[
72
5
-4
1
2
]÷3
3
5

=1

1
3
×
99
10
×
5
18

=

11
3

(2)(2

5
8
-1
4
7
)÷[(3
1
12
+4.375)÷19
8
9
],

=1

3
56
÷[7
11
24
÷19
8
9
],

=

59
56
÷
3
8

=

59
21

(3)

10
13
÷2
19
22
-1.4×
11
13
+7+
22
63
×20%,

=

10
13
×
22
63
-
7
5
×
11
13
+7+
22
63
×
1
5

=7+(

10
13
+
1
5
)×
22
63
-
7
5
×
11
13

=7+

63
65
×
22
63
-
7
5
×
11
13

=7+

22
65
-
77
65

=7

22
65
-1
12
65

=6

2
13

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