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Petreananamaria
a fost răspuns

calculati a si 4ab+8ac,stiind ca 7a+4b+8c=64 si b+2c=9

Răspuns :

Spidie
b+2c=9

7a+4b+8c=64
7a+4*(b+2c)=64
7a+4*9=64
7a=64-36
7a=28
a=28/4
a=4


4ab+8ac=4a*(b+c)= 4*4*9=144