Calculeaza :
a) a+b+c, stiind ca :a=4×8, b= a-8,c=5×9
b) a×b-c, stind ca : a=7×5-32,b=a×3,c=50-5×9.
C) a-b×c, stiind xa:a=6×5+48,b=3×4-10,c=2+2×3