题目内容

怎样算简便就怎样算.
7
13
+0.2+
6
13
+
4
5
②(7.5+7.5+7.5+7.5)×125×21-(
7
12
-
1
2
)×3
5
6
×0.25+
1
4
×
1
6
7
13
+0.2+
6
13
+
4
5

=(
7
13
+
6
13
)+(0.2+0.8),
=1+1,
=2;

②(7.5+7.5+7.5+7.5)×125×2
=7.5×4×(125×2),
=7.5×(4×250),
=7.5×1000
=7500;

1-(
7
12
-
1
2
)×3

=1-(
7
12
-
6
12
)×3,
=1-
1
12
×3,
=1-
1
4

=
3
4


5
6
×0.25+
1
4
×
1
6

=
5
6
×0.25+0.25×
1
6

=(
5
6
+
1
6
)×0.25,
=1×0.25,
=0.25.
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