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

(6-x)*(6+x)=-2

(a-6)*(a+6)=2-

(6-cd)*(6+cd)=-()2

(8b-6)*(8b+6)=*2-

(8b-6)*(8b+6)=(*)2-

(17-m)*(17+m)=-2

(z-17)*(z+17)=2-

(17-cd)*(cd+17)=-()2

(6b-17)*(6b+17)=*2-

(6b-17)*(17+6b)=(*)2-

(8ab-zx)*(zx+8ab)=*()2-()2

(8z+a)*(a-8z)=2-*2

(mlu+8k)*(8k-mlu)=*2-()2

(17bc3-8x)*(8x+17bc3)=*b2c6-*2

(17bc3-8x)*(8x+17bc3)=(*bc3)2-*2



×