6. Verifique quais das igualdades a segui são verdadeiras, reescrevendo as falsas de modo a torna-las verdadeiras:
A) (4x-7)²= (4x)² - 2.4x.7- 7²= 16x-56x-49
B) (b-1/5)²=b²-2.b.1/5+(1/5)²= b²-2b/10+1/25=b²-b/5+1/25
C)(a-0,5)²=a²-2.a.(0,5)+(0,5)²= a²-a+0,25
D)(5x²-y)²= (5x)²+2.(5x²).y+y²= 25x² +10x²y+y²
URGENTEEEEEEEE
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