问题 解答题
用合适的方法计算.
35×12+350÷70
54.2-
2
9
+4.8-
16
9
3
7
÷
5
6
+
4
7
×
6
5
0.7÷[(
5
6
-
1
4
)×24]
1
17
+
1
4
)×4+
13
17
4
5
+
1
4
)÷
7
3
+
7
10
答案

(1)35×12+350÷70,

=420+5,

=425;

(2)54.2-

2
9
+4.8-
16
9

=(54.2+4.8)-(

2
9
+
16
9
),

=59-2,

=57;

(3)

3
7
÷
5
6
+
4
7
×
6
5

=

3
7
×
6
5
+
4
7
×
6
5

=(

3
7
+
3
7
)×
6
5

=1×

6
5

=

6
5

(4)0.7÷[(

5
6
-
1
4
)×24]

=0.7÷[

5
6
×24-
1
4
×24
],

=0.7÷[20-6],

=0.7÷14,

=0.05;

(5)(

1
17
+
1
4
)×4+
13
17

=

1
17
×4+
1
4
×
4+
13
17

=

4
17
+
13
17
+1,

=1+1,

=2;

(6)(

4
5
+
1
4
)÷
7
3
+
7
10

=

21
20
×
3
7
+
7
10

=

9
20
+
7
10

=

23
20

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