Fill in the blanks: 1 1. 0 12. Write a ... 13.2X=6, 2Y=2, and the solution is X=3, y = 1 14.y =-5/2+.

15.a=-2 16。 7, 1 1/2,4,5/2, 1,- 1/2,-2 17.36 18.( 1)6X+8Y=88 (2)Y=2 (3)8

19.m=33 20.20，9

Do this problem by yourself .. Don't look at the title, don't look at the answer. ...