Объяснение:
1. (c-d)(c+d) = c^2 - d^2
2. (3+m)(3-m) = 9 - m^2
3. (5a+2b)(2b-5a) = 4b^2 - 25a^2
4. (1-k)(1+k) = 1 - k^2
5. (6-7x)(7x+6) = 36 - 49x^2
1. (c-d)(c+d)=c²+cd-cd-d²=c²-d²
2. (3+m)(3-m)=9-3m+3m-m²=9-m²
3. (5a+2b)(2b-5a)=10ab-25a²+4b²-10ab=-25a²+4b²=4b²-25a²
4. (1-k)(1+k)=1+k-k-k²=1-k²
5. (6-7x)(7x+6)=42x+36-49x²-42x=36-49x²
(a+b)(a-b)=a²-b²
Объяснение:
1. (c-d)(c+d) = c^2 - d^2
2. (3+m)(3-m) = 9 - m^2
3. (5a+2b)(2b-5a) = 4b^2 - 25a^2
4. (1-k)(1+k) = 1 - k^2
5. (6-7x)(7x+6) = 36 - 49x^2
1. (c-d)(c+d)=c²+cd-cd-d²=c²-d²
2. (3+m)(3-m)=9-3m+3m-m²=9-m²
3. (5a+2b)(2b-5a)=10ab-25a²+4b²-10ab=-25a²+4b²=4b²-25a²
4. (1-k)(1+k)=1+k-k-k²=1-k²
5. (6-7x)(7x+6)=42x+36-49x²-42x=36-49x²
Объяснение:
(a+b)(a-b)=a²-b²