题目内容

怎样算简便就怎样算.
①520+2613÷13
2
9
×5×
9
20

③(
4
5
+
1
4
)÷
7
5
+
1
4

④(
2
3
+
4
7
-
1
6
)÷
1
42

7
11
÷62.5%+
4
11
×
8
5
①520+2613÷13,
=520+201,
=721;

2
9
×5×
9
20

=
2
9
×
9
20
×5,
=
1
10
×5,
=
1
2


③(
4
5
+
1
4
)÷
7
5
+
1
4

=
21
20
÷
7
5
+
1
4

=
3
4
+
1
4

=1;

④(
2
3
+
4
7
-
1
6
)÷
1
42

=(
2
3
+
4
7
-
1
6
)×42,
=
2
3
×42+
4
7
×42-
1
6
×42,
=28+24-7,
=52-7,
=45;

7
11
÷62.5%+
4
11
×
8
5

=
7
11
×
8
5
+
4
11
×
8
5

=(
7
11
+
4
11
)×
8
5

=1×
8
5

=
8
5
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