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