1
8
+0.375
=
2.8÷0.7=
3
4
×0.8
=
7-3
2
5
=
(
1
3
-
1
7
)×21
=
0.04÷0.09=
1
8
+0.375
=0.125+0.375
=0.5;
②2.8÷0.7=4;
3
4
×0.8
=
3
4
×
4
5

=
3
5
;
④7-3
2
5
=3
3
5
;
⑤(
1
3
-
1
7
)×21
=
1
3
×21-
1
7
×21
=7-3
=4;
⑥0.04÷0.09
=
1
25
÷
9
100

=
1
25
×
100
9

=
4
9
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