(2y-3)(2y+3)=,(x+1)(x-1)=,(5a+3b)(5a-3b)=,(7m-4n)(7m+4n)=,(xy+5)(xy-5)=,(11p-6q)(11p+6q)=,口答(平方差公式）,(9b+8a)(8a-9b)=,(2x+13y)(-13y+2x)=,(15n+6)(6-15n)=,(-9p+17)(9p+17)=,(-18x-19y)(-18x+19y)=,(a+b+c)(a+b-c)=,(x-3+y)(x+y+3)=,(m+n+1)(m-n-1)=,(p+4q)2= (xy-1)2=,口答（完全平方公式）,(a+2b)2= (-2+y)2=,(-x+3)2= (m-3n)2=,(x+1)2= (x-y)2=,(s+5)2= (-x-5y)2=,(x+6y)2= (6-xy)2=,(2x+y)2= (a-4b)2=,(-3x+2)2= (3m-n)2=,( x+y)2= ( y-1)2=,(x+y+z)2= (a-b+c)2=,(2x-y+3z)2= (m-n-5)2=,