(a-2b)^6=a^6-12*a^5*b+60 *a^4*b^2-160 *a^3*b^3+240 *a^2*b^4-192 *a*b^5+b^6.
2) (1+2x)^5=1+10*x+40*x^2+80*x^3+80*x^4+32*x^5.
(a-2b)^6=a^6-12*a^5*b+60 *a^4*b^2-160 *a^3*b^3+240 *a^2*b^4-192 *a*b^5+b^6.
2) (1+2x)^5=1+10*x+40*x^2+80*x^3+80*x^4+32*x^5.