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计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82④78-517+98-1217⑤29-716×29⑥13÷(14+56)×34.

题目详情
计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.
①16×18-120÷15 ②3.2×2.77+0.23×3.2 ③7.6-2.05÷0.82
7
8
-
5
17
+
9
8
-
12
17
2
9
-
7
16
×
2
9
⑥13÷(
1
4
+
5
6
)×
3
4
①16×18-120÷15 ②3.2×2.77+0.23×3.2 ③7.6-2.05÷0.82
7
8
-
5
17
+
9
8
-
12
17
2
9
-
7
16
×
2
9
⑥13÷(
1
4
+
5
6
)×
3
4
①16×18-120÷15 ②3.2×2.77+0.23×3.2 ③7.6-2.05÷0.82①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82 ④
7
8
-
5
17
+
9
8
-
12
17
2
9
-
7
16
×
2
9
⑥13÷(
1
4
+
5
6
)×
3
4
7
8
-
5
17
+
9
8
-
12
17
7
8
-
5
17
+
9
8
-
12
17
7
8
7788
5
17
+
9
8
-
12
17
5
17
551717
9
8
-
12
17
9
8
9988
12
17
12
17
12121717⑤
2
9
-
7
16
×
2
9
2
9
-
7
16
×
2
9
2
9
2299
7
16
×
2
9
7
16
771616
2
9
2
9
2299⑥13÷(
1
4
+
5
6
)×
3
4
1
4
+
5
6
)×
3
4
1
4
1144
5
6
)×
3
4
5
6
5566
3
4
3
4
3344
▼优质解答
答案和解析

①16×18-120÷15,
=288-8,
=280;

②3.2×2.77+0.23×3.2,
=3.2×(2.77+0.23),
=3.2×3,
=9.6;

③7.6-2.05÷0.82,
=7.6-2.5,
=5.1;

7
8
-
5
17
+
9
8
-
12
17

=(
7
8
+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
7
8
777888-
5
17
+
9
8
-
12
17

=(
7
8
+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
5
17
555171717+
9
8
-
12
17

=(
7
8
+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
9
8
999888-
12
17

=(
7
8
+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
12
17
121212171717,
=(
7
8
+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
7
8
777888+
9
8
)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
9
8
999888)-(
5
17
+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
5
17
555171717+
12
17
),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
12
17
121212171717),
=2-1,
=1;

2
9
-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
2
9
222999-
7
16
×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
7
16
777161616×
2
9

=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
2
9
222999,
=
2
9
×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
2
9
222999×(1-
7
16
),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
7
16
777161616),
=
2
9
×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
2
9
222999×
9
16

=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
9
16
999161616,
=
1
8


⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
1
8
111888;

⑥13÷(
1
4
+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
1
4
111444+
5
6
)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
5
6
555666)×
3
4

=13÷
13
12
×
3
4

=12×
3
4

=9.
3
4
333444,
=13÷
13
12
×
3
4

=12×
3
4

=9.
13
12
131313121212×
3
4

=12×
3
4

=9.
3
4
333444,
=12×
3
4

=9.
3
4
333444,
=9.