А) ...=ab²+a²b=ab*(b+a)
b)...=
*(2+5-8-11)=-12
c)...=24bc³-2ac=2c*(12bc²-a)
d)...=xy*(12-5-2)=5xy
e)...=y²*(-3.1+2.1-1)=-2y²
f)...=-280x³y-18xy²=-2xy*(140x²+9y)
a)...=x²y+xy²=xy*(x+y)
b)...=6a³b+8ac=2a*(3a²b+4c)
c)...=x³*(1.9-2.9-1)=-2x³
d)...=xy*(20+5-17)=8xy
e)...=ab²*(8-3+1-7)=-ab²
f)...=-120xy²+28x²y=4xy*(-30y+7x)