题目内容

计算下面各题.
9.8-1.8×0.45
5
7
+
2
7
÷
2
21
5
6
-
1
8
)÷
5
12
8
9
÷
4
15
-
5
9
)×
6
25

(1)9.8-1.8×0.45,
=9.8-0.81,
=8.99;

(2)
5
7
+
2
7
÷
2
21

=
5
7
+3,
=3
5
7


(3)(
5
6
-
1
8
)÷
5
12

=
17
24
÷
5
12

=
17
10


(4)(
8
9
÷
4
15
-
5
9
)×
6
25

=(
10
3
-
5
9
)×
6
25

=
25
9
×
6
25

=
2
3
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