题目内容

计算下列各题.
1
9
×10÷
5
9
2
5
+
1
4
×
6
7
18×(
1
3
+6÷
9
7
9
32
÷[
3
4
-(
7
16
-
1
4
)].
(1)
1
9
×10÷
5
9

=
1
9
×10×
9
5

=2;

(2)
2
5
+
1
4
×
6
7

=
2
5
+
3
14

=
43
70


(3)18×(
1
3
+6÷
9
7

=18×(
1
3
+6×
7
9

=18×(
1
3
+
14
3

=18×5
=90;

(4)
9
32
÷[
3
4
-(
7
16
-
1
4
)]
=
9
32
÷[
3
4
-
7
16
+
1
4
]
=
9
32
÷[(
3
4
+
1
4
)-
7
16
]
=
9
32
÷[1-
7
16
]
=
9
32
÷
9
16

=
9
32
×
16
9

=
1
2
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