(1) (12 2 7 -4 3 5 ÷2.3)÷(10 2 7 ÷0.875) (2)7.08+8.13×12.9÷(8

2025-03-10 20:05:43
推荐回答(1个)
回答1:

(1) (12
2
7
-4
3
5
÷2.3)÷(10
2
7
÷0.875)

=(12
2
7
-4.6÷2.3)÷(
72
7
÷
7
8
),
=(12
2
7
-2)÷
72
7
×
8
7

=
72
7
÷
72
7
×
8
7

=
8
7

(2)7.08+8.13×12.9÷(86×40.65)
=7.08+104.877÷3495.9,
=7.08+0.03,
=7.11;
(3) (2.25×
25
27
-16÷9)×(54-26+181-174+46)×100

=(
9
4
×
25
27
-
16
9
)×[(54+46)+181-(26+174)]×100,
=(
25
12
-
16
9
)×(100+181-200)×100,
=
11
36
×81×100,
=2475;

(4) [3
1
4
-(0.2+
1
3
)×4
1
2
+0.5]÷13.5%

=[3
1
4
-(
1
5
+
1
3
)×
9
2
+
1
2
]÷13.5%,
=(3
1
4
-
8
15
×
9
2
+
1
2
)÷13.5%,
=(3
1
4
-
12
5
+
1
2
)÷13.5%,
=1.35÷0.135,
=10.