1) 5a(a-1)+3(a-1)=(5а+3)(а-1)
2) 7x^2-7y^2=7 (х^2-у^2)=7(х-у)(х+у)
3) 8x-8y+ax-ay=8 (х-у) +а (х-у)=(8+а)(х-у)
4) 11x^2-22xy+11y^2=11 (х^2-2ху+у^2)=11× (х-1)^2
1) 5a(a-1)+3(a-1)=(5а+3)(а-1)
2) 7x^2-7y^2=7 (х^2-у^2)=7(х-у)(х+у)
3) 8x-8y+ax-ay=8 (х-у) +а (х-у)=(8+а)(х-у)
4) 11x^2-22xy+11y^2=11 (х^2-2ху+у^2)=11× (х-1)^2