题目内容

脱式计算,能简算的要简算.
①0.25×
75
31
+
49
31
×25%
7
10
÷(1-
3
4
×
2
5

③(84%÷3+8.72)×(1-
1
9

④12×(
1
2
-
3
4
①0.25×
75
31
+
49
31
×25%
=
1
4
×
75
31
+
49
31
×
1
4

=
1
4
×(
75
31
+
49
31

=
1
4
×4
=1;

7
10
÷(1-
3
4
×
2
5

=
7
10
÷(1-
3
10

=
7
10
÷
7
10

=1;

③(84%÷3+8.72)×(1-
1
9

=(0.84÷3+8.72)×
8
9

=(0.28+8.72)×
8
9

=9×
8
9

=9;

④12×(
1
2
-
3
4

=12×
1
2
-12×
3
4

=6-9
=-3.
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