用你喜欢的方法计算.(1)230-2.6×1.5(2)36×( 2 9 + 7 12 )(3)2÷ 2

2025-04-23 23:27:27
推荐回答(1个)
回答1:

(1)230-2.6×1.5,
=230-3.9,
=226.1;

(2)36×(
2
9
+
7
12
),
=36×
2
9
+
7
12
×36,
=8+21,
=29;

(3)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(4)42÷[14-(50-39)],
=42÷[14-11],
=42÷3,
=14.