28.34
в)= 25с²+70сd+49d²-70cd=25c²+49d²
г)=64m²-16mn+n²-64m²=-16mn+n²
28.36
a)= (3a)²-b²+b²=9a²
б)= 9х²-(у²- 16х²)=9х²-у²+16х²=8у²+16х²
в)=(5с)²-(6d)²-25c²=25c²-36d²-25c²= -36d²
г)= (7m)²-(10n)²-100n²= 49m²-100n²-100n²=49m²-200n²
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Answers & Comments
28.34
в)= 25с²+70сd+49d²-70cd=25c²+49d²
г)=64m²-16mn+n²-64m²=-16mn+n²
28.36
a)= (3a)²-b²+b²=9a²
б)= 9х²-(у²- 16х²)=9х²-у²+16х²=8у²+16х²
в)=(5с)²-(6d)²-25c²=25c²-36d²-25c²= -36d²
г)= (7m)²-(10n)²-100n²= 49m²-100n²-100n²=49m²-200n²