1. 80= 2^4×5
48= 2^4×3
cmmmc= (80,48) = 2^4×3×5=48×5=240
2. -10×(-9)×(-8)×(-7)×(-6)×(-5)×(-4)×(-3)×(-2)×(-1)×1×2×3×4×5×6×7×8×9×10×11=0 Fiindca orice numar inmultit cu 0 da 0
3. 12+3b/18+2a=2/3
3(4+b)/2(9+a)=2/3
4(9+a) =9(4+b)
36+4a =36+ 9b
4a=9b
a/b= 9/4
4. 180-17° si 21 de minute = 179° si 60 de minute -17° si 21 de minute = 162° si 39 de minute.
5. 3l = 12
l= 12/3 =4
4h=20 min
h=5
sm= 12+12+3×5=24+15=39
6. f(a) = a+6 =9 rezulta a = 3
f(10) = 10+6= b rezulta b= 16
a+b= 3+16=19
