Question

Разложите на множители: 

1)4c^2-49d^2

2)x^2y^2-0,04

3)a^2b^2-c^2

4)p^2q^2-4k^2

Answer 1

(2с-7d)(2c+7d)

(xy-0.2)(xy+0.2)

(ab-c)(ab+c)

(pq-2k)(pq+2k)

Answer 2

1)4c^2-49d^2=(2c-7d)(2c+7d)

2)x^2y^2-0,04=(xy-0.2)(xy+0.2)

3)a^2b^2-c^2=(ab-c)(ab+c)

4)p^2q^2-4k^2=(pq-2k)(pq+2k)

a^2-b^2=(a-b)(a+b)