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Daca a=25 si b+c=9 calculati
A)ab+ac=
B)3a+2b+2c=
C)5b+5c-2a=
D)(b+c)²-2a=
Va rog ajutatima!!


Răspuns :

ab+ac=a(b+c)=25 x 9=225

a=25I x3 =>3a=75
b+c=9 I x2 =>2(b+c)=18
3a+2b+2c=75+18=93

b+c=9 I x5 =>5(b+c)=9x5=45
2a=25x2=50
5b+5c-2a=45-50= -5

9²-2x25=81-50=31