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神机妙算:2842÷14+74×389÷(56-34)3.6×99+3.634÷(35×38)45×67+17÷5472×(59-512)

题目详情
神机妙算:
2842÷14+74×3         
8
9
÷( 
5
6
-
3
4
)              
3.6×99+3.6
3
4
÷( 
3
5
×
3
8
)         
4
5
×
6
7
+
1
7
÷
5
4
             
72×(
5
9
-
5
12
▼优质解答
答案和解析
(1)2842÷14+74×3
=2848÷7÷2+74×3,
=203+222,
=425;

(2)
8
9
÷(
5
6
-
3
4

=
8
9
×12,
=10
2
3


(3)3.6×99+3.6
=(99+1)×3.6,
=100×3.6,
=360;

(4)
3
4
÷(
3
5
×
3
8

=
3
4
×
40
9

=
10
3


(5)
4
5
×
6
7
+
1
7
÷
5
4

=
4
5
×
6
7
+
1
7
×
4
5

=(
6
7
+
1
7
)×
4
5

=1×
4
5

=
4
5


(6)72×(
5
9
-
5
12

=72×
5
9
-72×
5
12

=40-30,
=10.