问题 解答题
递等式计算:
1.8×[6
5
12
÷16+
3
8
×(9-2
7
12
)]÷2
3
4

12
2
3
÷0.8-[6
2
3
+1
7
18
×(2
3
4
-2.15)].
答案

(1)1.8×[6

5
12
÷16+
3
8
×(9-2
7
12
)]÷2
3
4

=1.8×[6

5
12
÷16+
3
8
×
77
12
]÷2
3
4

=1.8×[

77
12
×
1
16
+
3
8
×
77
12
]÷2
3
4

=1.8×[(

1
16
+
3
8
)×
77
12
]÷2
3
4

=1.8×[

7
16
×
77
12
]÷2
3
4

=

9
5
×
7
16
×
77
12
×
4
11

=

147
80

(2)12

2
3
÷0.8-[6
2
3
+1
7
18
×(2
3
4
-2.15)],

=12

2
3
÷0.8-[6
2
3
+1
7
18
×
3
5
],

=12

2
3
÷0.8-[6
2
3
+
5
6
],

=12

2
3
÷0.8-
45
6

=

95
6
-
45
6

=

25
3

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