Réponses

  • Utilisateur Brainly
2013-11-01T15:53:12+01:00
a) 26 x 34
=(30-4)(30+4)
=30²-4²
=900-16
=884

b) 1010²
=(1000+10)²
=1000²+10²+20 000
=1000 000+20 000 +100
=1020 100

c) 79²

=(80-1)²
=80²+1²-160
=6400+1-160
=6241