Question

daca se stie a+3b=5 si c=8 calculeaza 4a+12b+5c b 2a +3b=5 si 2c+b=7 calculeaza 4a+7b+2c c x+2y=5 si a+3b=6 calculeaza 2x+4y+4a+12b si 8x+16y+8a+24b d 3x+y=10 si 2y+z=3 calculeaza 9x+5y+z si 3x+5y+2z

Answer 1

a.4×(a+3b)+5×8=
=4×5+40=
=20+40=
=60
b.2×(2a+3b)+7=
=2×5+7=
=10+7=
=17
c.2×(x+2y)+4×(a+3b)=
=2×5+4×6=