умножения: 1) (6x+14y) (14y-6x) 2) (9m-11n)(11n+9m) 3) (-4a+6b)(6b+4a) 4) (-15c+7d) (15c+7d) 5) (10a⁷+9b⁶)(9b⁶-10a⁷) 6) (13b⁴-8d³) (8d³+13b⁴) 7) (-10m-6n) (10m-6n) 8) (-14a-5b) (14a-5b) 9) (3c-b) (b-3c) 10) (6x-7y) (7y-6x 11) (9m-5n)(5n-9m)

1)

(6x+14y)(14y-6x) = (14y+6x)(14y-6x) = (14y)²-(6x)² = 196y²-36x²

2)

(9m-11n)(11n+9m) = (9m-11n)(9m+11n) = (9m)²-(11n)² = 81m²-121n²

3)

(-4a+6b)(6b+4a) = (6b-4a)(6b+4a) = (6b)²-(4a)² = 36b²-16a²

4)

(-15c+7d)(15c+7d) = (7d-15c)(7d+15c) = (7d)²-(15c)² = 49d²-225c²

5)

(10a⁷+9b⁶)(9b⁶-10a⁷) = (9b⁶+10a⁷)(9b⁶-10a⁷) = (9b⁶)²-(10a⁷)² = 81b¹²-100a¹⁴

6)

(13b⁴-8d³)(8d³+13b⁴) = (13b⁴-8d³)(13b⁴+8d³) = (13b⁴)²-(8d³)² = 169b⁸-64d⁶

7)

(-10m-6n) (10m-6n) = -(10m+6n) (10m-6n) = -((10m)²-(6n)²) = -(100m²-36n²) = -100m²+36n²

8)

(-14a-5b) (14a-5b) = -(14a+5b) (14a-5b) = -((14a)²-(5b)²) = -(196a²-25b²) = -196a²+25b²

9)

(3c-b) (b-3c) = -(b-3c)(b-3c) = -(b-3c)² = -(b²-6bc+9c²) = -b²+6bc-9c²

10)

(6x-7y) (7y-6x) = -(7y-6x)(7y-6x) = -(7y-6x)² = -(49y²-84xy+36x²) = -49y²+84xy-36x²

11)

(9m-5n)(5n-9m) = -(5n-9m)(5n-9m) = -(5n-9m)² = -(25n²-90mn+81m²) = -25n²+90mn-81m²

Ответ: См. решение выше