题目内容

脱式计算,能简算的要简算.
①2013×0.25+2013×0.75
②1.25×32×0.25
③12×(
5
6
+
1
2
-
1
3

2
3
+(
5
6
-
3
4
)÷
3
8
①2013×0.25+2013×0.75
=2013×(0.25+0.75)
=2013×1
=2013;

②1.25×32×0.25
=1.25×(8×4)×0.25
=(1.25×8)×(4×0.25)
=10×1
=10;

③12×(
5
6
+
1
2
-
1
3

=12×
5
6
+12×
1
2
-12×
1
3

=10+6-4
=16-4
=12;

2
3
+(
5
6
-
3
4
)÷
3
8

=
2
3
+
1
12
÷
3
8

=
2
3
+
2
9

=
8
9
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