(a-b)2=a2-2ab+b2

(9-b)2=±±b±b2

(a-9)2=±a2±a±

(9a-b)2=±*2±**b±b2

(a-9b)2=±a2±*a*+*2

(9-t)2=±±18t±t2

(9-t)*(9-t)=±±18t±t2

(t-9)*(9-t)=±t2±18t±

(10-z)*(10-z)=±±z±z2

(x-9)*(9-x)=±x2±x±

(10ax-bz)*(10ax-bz)=±*()2±**bz±(bz)2

(vt-9up)*(9up-vt)=±(vt)2±*vt*±*()2

(9-z)*(9-z)=±±z±z2

(9-x)*(x-9)=±x2±x±

(9x-bz2)*(9x-bz2)=±*()2±**bz2±(bz2)2

(10dp-t)*(t-10dp)=±t2±*t*±*()2


×