2 and 5 1 ÷2and 51

= 1

2、

3 ÷ 4 out of 5

= 3x 5/4

= 15/4

3、

2 and 8 71

=2 7/8

4、

5 3/7 = 38/7, so m = 7/38.

2 3/7 = 17, so n = 65438+7/07.

M+n = 7+in 38/7 in kloc-0/7.

=114+266 of 646.

= 380 out of 646 people

= 190 in 323。

So the reciprocal of m+n is 65438+323 divided by 090.

5、

A and b are reciprocal, so ab= 1.

C and d are opposites, so C+D=0.

m？ = 1, so m = 1.

therefore

1.000 m2 (C+D)+M2-2Ax 1003B

= 1.000 0+ 1-2x 1003+0003

=0+ 1-2006

=-2005

6、

A and B are opposites, so A+B=0.

C and d are reciprocal, so CD= 1.

So the CD score (A+B)= 1 0=0.

7、

0./kloc-reciprocal of 0/25: 8

The reciprocal of 4 and 6/7: 7/34.

The reciprocal of 3.3: 00 of 65438+33.

Reciprocal of x+y: 1/(x+y)