a2-b2=(a-b)(a+b)

(3-x)*(3+x)=-2

(a-3)*(a+3)=2-

(3-cd)*(3+cd)=-()2

(4b-3)*(4b+3)=*2-

(4b-3)*(4b+3)=(*)2-

(16-m)*(16+m)=-2

(z-16)*(z+16)=2-

(16-cd)*(cd+16)=-()2

(3b-16)*(3b+16)=*2-

(3b-16)*(16+3b)=(*)2-

(4ab-zx)*(zx+4ab)=*()2-()2

(4z+a)*(a-4z)=2-*2

(mlu+4k)*(4k-mlu)=*2-()2

(16bc3-4x)*(4x+16bc3)=*b2c6-*2

(16bc3-4x)*(4x+16bc3)=(*bc3)2-*2


×