1) a) t^2+tx+11x+11t=t^2+11t+tx+11x=t(t+11)+x(t+11)=(t+x)(t+11)
б) 8m^2-2m^3-4+m = 2m^2(4-m)-(4-m)=(2m^2-1)(4-m)
2) 18k^2+7y-7ky-18k=18k^2-18k-7ky+7y= 18k(k-1)-7y(k-1)=(18k-7y)(k-1) = (18*1/9 - 7*2/7)(1/9-1) = (2-2)(-8/9)=0*(-8/9)=0
3) 0.7*2.7 - 1.4*0.7 + 0.3*2.7 - 1.4*0.3 = 0.7*2.7 +0.3*2.7 - 1.4*0.7 - 1.4 * 0.3 = 2.7 *(0.7 + 0.3) -1.4* (0.7+0.3) = 2.7 - 1.4= 1.3