Answered

Comment je réduis 5x*2y*2xy ; 9a+8b-(15a-4b) ; 5x*2y-(2y*7y+xy) ; 5a*(ab-b)-a puissance 2... Je galère trooop.

Sagot :

DROOPETTE
5x*2y*2xy
=20x²y²

9a+8b-(15a-4b)
=9a+8b-15a+4b
=-6a+12b

5x*2y-(2y*7y+xy)
=10xy-14y²+xy
=11xy-14y²

5a*(ab-b)-a²
=5a²b-5ab-a²