1. 2 * х ^ 2 – 0 , 5 * у + 6 = 2 * 4 ^ 2 - 0. 5 * ( - 2 ) + 6 = 2 * 16 + 1 / 2 * 2 + 6 = 32 + 1 + 6 = 33 + 6 = 39; 2. 5 * а ^ 2 * ( 4 * а ^ 3 – а ^ 2 + 1) = 5 * a ^ 2 * 4 a ^ 3 - 5 * a ^ 2 * a ^ 2 + 5 * a ^ 2 * 1 = 20 * a ^ 5 - 5 * a ^ 4 + 5 * a ^ 2; 3. (3с – х) (2с – 5х) = 3 * c * 2 * c - 3 * c * 5 * x - 2 * x * c + 5 * x * x = 6 * c ^ 2 - 15 * c * x - 2 * x * c + 5 * x ^ 2 = 6 * c ^ 2 - 17 * c * x + 5 * x ^ 2 ;4.(3х – 5у – 2)(-7х – 1) = - 21 * x ^ 2- 3 * x + 35 * x * y + 5 * y + 14 * x + 2 = - 21 * x ^ 2 + 35 * x * y + 5 * y + 11 * x + 2 ;5. (а + 2б + 3с)(2а – б + 2с) = 2 * a ^ 2 - a b +2ac+4ab-2b ^2+4bc+6ac-3cb+6c^ 2= 2 * a ^ 2 +2ac+3ab-2b ^2+bc+6ac+6c^ 2; 6. (3а + 2b) = 3 * a + 2 * b; 7. 5х (2х + 3) – (х – 1) (х – 6) = 10 x^ 2 + 15 x - ( x ^ 2 - 6 x - x + 6 ) = 10 x^ 2 + 15 x - x ^ 2 + 6 x + x - 6 = 9 x^ 2 + 22x - 6 ;8. (а – с)^ 2 – с (а – 3с) = a ^ 2 - 2 ac + c ^ 2 - ac + 3 c ^ 2 = a ^ 2 - 3 ac + 4 c ^ 2; 9. 6(а-2)(а-3) – 4(а-3)(а-3) = 6a ^ 2- 18 a - 12 a + 36 - 4 a ^ 2 + 36 = 2a ^ 2- 30a +72.