问题 解答题
①27.055-1.02-8.99
1
12
÷(
1
2
-
1
3

③0.38×8.17+3.8×0.383-0.76
④[10-(2
1
7
×
3
8
+2
1
7
×
5
8
)
]÷7
6
7

1
8
+[2
4
9
÷(3.4-
11
15
6
11
].
答案

①27.055-1.02-8.99,

=26.035-8.99,

=17.045;

1
12
÷(
1
2
-
1
3
),

=

1
12
÷
1
6

=

1
12
×6,

=

1
2

③0.38×8.17+3.8×0.383-0.76

=0.38×8.17+0.38×0.383×10-0.76

=0.38×(8.17+3.83)-0.76,

=0.38×12-0.76,

=4.56-0.76,

=3.8;

④[10-(2

1
7
×
3
8
+2
1
7
×
5
8
)]÷7
6
7

=[10-2

1
7
×(
3
8
+
5
8
)]÷7
6
7

=[10-2

1
7
7
55

=10×

7
55
-
15
7
×
7
55

=

14
11
-
3
11

=1;

1
8
+[2
4
9
÷(3.4-
11
15
6
11
],

=

1
8
+[
22
9
÷(
17
5
-
11
15
)×
6
11
],

=

1
8
+[
22
9
÷
8
3
×
6
11
],

=

1
8
+[
22
9
×
6
11
×
3
8
],

=

1
8
+
1
2

=

5
8

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