题目内容

用递等式计算
①3÷
3
7
-
3
7
÷3
9
20
÷[
1
2
×(
2
3
+
4
5
)]
③(
1
3
-
1
6
+
1
4
)×12   
④5.7-(1.9-1.3)
①3÷
3
7
-
3
7
÷3,
=7-
1
7

=6
6
7


9
20
÷[
1
2
×(
2
3
+
4
5
)],
=
9
20
÷[
1
2
×
22
15
],
=
9
20
÷
11
15

=
27
44


③(
1
3
-
1
6
+
1
4
)×12,
=12×
1
3
-
1
6
×12+
1
4
×12,
=4-2+3,
=5;

④5.7-(1.9-1.3),
=5.7-0.6,
=5.1.
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