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①27.055-1.02-8.99②112÷(12-13)③0.38×8.17+3.8×0.383-0.76④[10−(217×38+217×58)]÷767⑤18+[249÷(3.4−1115)×611].

题目详情
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
].
▼优质解答
答案和解析
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