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20 10 Shenzhen Ermo science mathematics answer
The eighth problem of DBCAABCC can be solved by linear programming or infinite thinking.

9.2

10.56

1 1.2 root 3 divided by 3 (2 is wrong, please note A >;; b)

12

The square root of 13 6 divided by 3 *a a a.

14.( 1, root number 3)

15. Root number 3

16.( 1) Omit (2) 1/2.

17.( 1) 177 (2)0.5

18.( 1) Root sign 15 divided by 5.

19.( 1) is greater than or equal to 3 (2), which is discussed in different situations, that is, x = 1, and x = root sign [(8a+ 1)- 1]/4.

20. (1) x 2/4+y 2 =1(2) Prove that the problem (3) exists, the area is forgotten, and m is (0,-1).

21.(1) 2n (2) 2 (2n+1)-4 (3) proof problem

Note: 2 n refers to the n power of 2, and some answers may be remembered incorrectly. Please point out.