А) (m − 3) × (m + 3) + (m+6)2=2 m-9 + 2m + 12=2 m² +3 +2m=2 m + 2m + 3
Б) (2c-5)²-(5-2c)²= 4c -20с + 25-25 -20c + 4c=4с 2 20с + 25-25 +20c 4c 2=0
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А) (m − 3) × (m + 3) + (m+6)2=2 m-9 + 2m + 12=2 m² +3 +2m=2 m + 2m + 3
Б) (2c-5)²-(5-2c)²= 4c -20с + 25-25 -20c + 4c=4с 2 20с + 25-25 +20c 4c 2=0