题目内容

计算:
3060÷15-2.5×36
(
8
15
-
11
30
)×60
7
12
÷9+
1
9
×
5
12
x-
3
5
x=
6
5
42:
3
5
=x:
5
7
(1)3060÷15-2.5×36,
=204-90,
=114;

(2)(
8
15
-
11
30
)×60,
=
5
30
×60

=10;

(3)
7
12
÷9+
1
9
×
5
12

=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(4)x-
3
5
x=
6
5

2
5
x=
6
5

2
5
5
2
=
6
5
×
5
2

x=3;

(5)42:
3
5
=x:
5
7

3
5
x=42×
5
7

3
5
5
3
=30×
5
3

x=50.
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