脱式计算(能简算的药简算) 15÷[(23+15)×113] 7.05-3.84-0.16 4.3-(35+2.4÷225) 85

2025-02-25 19:03:34
推荐回答(1个)
回答1:

(1)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(2)7.05-3.84-0.16,
=7.05-(3.84+0.16),
=7.05-4,
=3.05;

(3)4.3-(
3
5
+2.4÷2
2
5
),
=4.3-(
3
5
+1),
=4.3-1.6,
=2.7;

(4)8
5
7
+4.1+1
2
7
+4.9,
=(8
5
7
+1
2
7
)+(4.1+4.9),
=10+9,
=19;

(5)4.5÷[(0.5+
3
4
)×1
1
5
],
=4.5÷[1.25×1
1
5
],
=4.5÷1.5,
=3.