This document contains 22 math problems involving polynomial expressions. The problems involve factoring, combining like terms, and simplifying rational expressions. They range in complexity from single term expressions to multiple term expressions involving multiple variables. The goal seems to be practicing various algebraic manipulation and simplification skills.

1. 1)- (3x3+4x2-7x+1)+(9x3-42-6x) 12x3 13x+1 2)- (7x3+2x2-11x-3x2)+(-3x2-2x2+5x-3)4x3-6x-3 3)- (4x3+5x-3)-(3x3+2x2+5x-7)X3-2x2+4

2. 4)- (6x3+5x-3)-(3x3+2x2+5x-7)6x3+5x-3-3x3-2x2-5x+7 5)- (2x+5)(3x-7)6x2+x-35 6)-(3x-4) (2x+9)6x2+19x-36 7)-(5x+7y)(3x+2y)15x2+14y2+31xy

3. 8)-(4x-3y)(3x+2y)12x2-6Y2-xy 9)-(2u+3)(u-9)+4u(u-2)6u2-13u-12 10)-(3u-1) (u-2)+7u(u+1)10u2+12u+2 11)-(3x+5)(2x2+9x-5)6x2+37x2+30x-25

4. 12)-(7x-4)(x3-x2+6) 7x4-18x3+4x218 13)-(t22t-5)(3t2-t+2) 7x4-18x3+4x2+18 14)-(r2-8r-2)(-r2+3r-1) r4+11r3-r2-22r+2

5. 13)- (x+1)(2x2 -2)(x3+5) 2x6+4x3+10x2+5x 14)-(2x-1)(x2-5)(x3-1) X5+6x4-4x3-2x2-12x+11 15)- 8x2y3-10x3y / 2x2y = 4y2-5x 16)-6a3b3-9a2b2+3ab4 / 3ab2 = 2a2b-3a+b2 17)-3u3v4-2u5v2+(u2v2)2 /u3v2 = u3v2

6. 18) 6a3b3-9a2b2+3ab4 / 3ab2 = 2a2b-3a+b2 19) 3u3v4-2u5v2+(u2v2)2 /u3v2 = u3v2 20) 6x2yz3-xy2z / xyz =6xz-y 21) (2x+3)(2x-3y) =4x2-6xy-9y2 22) (5x+4y)(5x-4y) =25x2-16y2