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

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

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

(4-cd)*(4+cd)=-()2

(6b-4)*(6b+4)=*2-

(6b-4)*(6b+4)=(*)2-

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

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

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

(4b-16)*(4b+16)=*2-

(4b-16)*(16+4b)=(*)2-

(6ab-zx)*(zx+6ab)=*()2-()2

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

(mlu+6k)*(6k-mlu)=*2-()2

(16bc3-6x)*(6x+16bc3)=*b2c6-*2

(16bc3-6x)*(6x+16bc3)=(*bc3)2-*2


×