用递等式计算.(1)2180+540÷18×24(2) 1 5 7 ×(5÷ 5 6 - 5 6

2024-11-25 16:13:06
推荐回答(2个)
回答1:

(1)2180+540÷18×24,
=2180+30×24,
=2180-720,
=1460;

(2) 1
5
7
×( 5÷
5
6
-
5
6
÷5 ),
= 1
5
7
×( 6-
5
6
÷5 ),
= 1
5
7
×( 6-
1
6
),
=
12
7
×
35
6

=10;

(3) 4
1
5
÷[2.5-0.4×( 2
4
5
-1.05)],
= 4
1
5
÷[2.5-0.4×1.75],
= 4
1
5
÷[2.5-0.7],
=4
1
5
÷1.8,
=
21
5
×
5
9

=
7
3


(4)[1-( 4
1
3
-1.75×2)]÷ 2
1
2

=[1-( 4
1
3
-3.5)]÷ 2
1
2

=[1-
5
6
2
1
2

=
1
6
×
2
5

=
1
15

回答2:

=24×(18+12)
=24×3o
=72O