Объяснение:
1) (a+1/7)²=a²+(2/7)a+1/49
2) (1/9+b)²=b²+(2/9)b+1/81
3) ((n/4)+(m/3))²=(n²/16)+(nm/6)+(m²/9)
4) ((k/2)-(t/5))²=(k²/4)-(kt/5)+(t²/25)
Объяснение:
1) (a+1/7)²=a²+(2/7)a+1/49
2) (1/9+b)²=b²+(2/9)b+1/81
3) ((n/4)+(m/3))²=(n²/16)+(nm/6)+(m²/9)
4) ((k/2)-(t/5))²=(k²/4)-(kt/5)+(t²/25)