пожалуйста решите 3 номера!

1.
a) t(t+x)+11(t+x)=(t+x)(t+11)
b) 2m(4-m)-(4-m)=
=(4-m)(2m-1)
2.
18k-18k+7y-7ky= =18k(k-1)+7y(1-k)= =18k(k-1)-7y(k-1)=
=(k-1)(18k-7y)=
=(1/9-1)(18/9-14/7)=(1/9-9/9)*
*2-2=0
3. (0.7*2.7-1.4*0.7)+(0.3*2.7-1.4*0.3)=0.7(2.7-1.4)+0.3(2.7-1.4)=(2.7-1.4)(0.7+0.3)=1.3*1=1.3