=(3 *-3 *-2)a * a * b * b * b = 18 a2 B3

(n power of x * y) * (m power of x * y)?

=xnyx2ym=x(n+2)y(m+ 1)

(2a+b)？ -(2a+b)(2a-b)

=4aa-4ab-bb-(4aa-4bb)=-4ab+3bb (complete square formula and variance formula)

(3a？ )-the cubic of ——6a * (the cubic of *(2a +3a? +a)

= 27 a6-6 a3×(2 a3+3 a2+a)= 27 a6-6 a4×(2 a2+3a+ 1)= 27 a6- 12 a6- 16 a5-6 a4

(2a+3b)？ (3b-2a)？

=[(2a+3b) (3b-2a)]？ =【9b？ -4a？ ] ? =8 1b4-72a2b2+ 16a2

(x-2y+3)(x+2y-3)

=[x-(2y-3)] [x+(2y-3)]=x？ -(2y-3)？ =x？ -4y？ + 12y-9

100 1?

=( 1000+ 1)? = 1000? +2000+ 1= 100200 1

20 1 1? -20 10*20 12

=20 1 1? -(20 1 1- 1)(20 1 1- 1)=20 1 1? -(20 1 1? - 1? )= 1