Question

1. Calculati cat mai repede:
a) (4+6+8+10):(2+3+4+5)
b) Daca a=3, b+c=7 si x+y=10, calculati: a+4b+4c si ax+ay+ab+ac

Answer 1

a) 28:14 = 2
b)a+4b+4b=3+4*7=31
ax+ay+ab+ac=3*10+3*7=30+21=51

Answer 2

a) faci grupe: (4:2)+(6:3)+(8:4)+(10:5)= 2+2+2+2=8 b) a+4b+4c=a+4(b+c)= 3+4•7= 3+28=31 ax+ay+ab+ac=a(x+y)+a(b+c)=3•7+3•10=21+30=51