计算下列各题.(能简算的要简算)23×516×3514÷(23-16)34×29+0.75×5912.5%×45÷1857÷[32×(1-37.5%)]1321×17+8÷2117.-数学

2,
=
1
2


(3)
3
4
×
2
9
+0.75×
5
9

=
3
4
×
2
9
+
3
4
×
5
9

=(
2
9
+
5
9
)×
3
4

=
7
9
×
3
4

=
7
12


(4)12.5%×
4
5
÷
1
8

=12.5%÷
1
8
×
4
5

=1×
4
5

=
4
5


(5)
5
7
÷[32×(1-37.5%)],
=
5
7
÷[32×0.625],
=
5
7
÷20,
=
1
28


(6)
13
21
×17+8÷
21
17

=
17
21
×13+8×
17
21

=
17
21
×(13+8),
=
17
21
×21,
=17.