Ответ:
1) (n+m)(n-m)=n²-mn+mn-m²=n²-m²
2) (b-2)²=(b-2)*(b-2)=b²-2b-2b+4=b²-4b+4
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Ответ:
1) (n+m)(n-m)=n²-mn+mn-m²=n²-m²
2) (b-2)²=(b-2)*(b-2)=b²-2b-2b+4=b²-4b+4