1)(t+m)²=t²+2tm+m²

2)(6c-7)²=36c²-84c+49

3)(2a-7b)²=4a²-28ab+49b²

4)(3m²+t³)²=9m^4+6t³m²+t^6

Объяснение:

1)(t+m)²=t²+2mt+m²

2)(6c-7)²=36c²-2*6c*7+7²=36c²-84c+49

3)(2a-7b)²=4a²-2*2a*7b+49b²=4a²-28ab+49b²

4)(3m²+t³)²=9m⁴-2*3m²*t³+t⁶=9m⁴-6m²t³+t⁶