用你喜欢的方法计算89×(14+38)13×34+2÷43+34 12÷(45×4+65×4)

用你喜欢的方法计算89×(14+38)13×34+2÷43+34 12÷(45×4+65×4).
2024-12-03 19:29:35
推荐回答(1个)
回答1:

(1)

8
9
×(
1
4
+
3
8

=
8
9
×
1
4
+
8
9
×
3
8

=
2
9
+
1
3

=
5
9


(2)13×
3
4
+2÷
4
3
+
3
4

=13×
3
4
+2×
3
4
+
3
4

=(13+2+1)×
3
4

=16×
3
4

=12;

(3)12÷(
4
5
×4+
6
5
×4)

=12÷[(
4
5
+
6
5
)×4]
=12÷[2×4]
=12÷8
=1.5.