Question

（-2x+3）（-2x-3）= （3mn+2分之一）（3mn-2分之一）-m的平方 n的平方=

Answer 1

1、
=(-2x)²-3²
=4x²-9

2、
=(3mn)²-(1/2)²-m²n²
=9m²n²-1/4-m²n²
=8m²n²-1/2

Answer 2

=[(A+2)(A-2)+4]/(A-2)]÷[A/(A-2)]
=[A2/(A-2)]×[(A-2)/A]
=A
=(a-2)-1/(a-2)
=[(a-2)^2-1]/(a-2)
=(a-2+1)(a-2-1)/(a-2)
=(a-1)(a-3)/(a-2)