Răspuns:
Explicație pas cu pas:
2a)
3/4:2/5=3/4×5/2=15/8
b)(-1/2):3/7=-7/6
c)2/3:(-3/5)==-10/9
d)(-1/11):(-3/7)=7/33
3. a=0,3 b=0,(3)
ab=3/10×3/9=1/10
a/b=3/10:3/9=9/10
5. a) -3/2
b)-5/11
c)-1/5
d)-1,2(3)=-1-(23-2)/90=-1-7/30=-37/30 inversul -30/37
6. a) 3/8(-4/15)=-2/5
b)-27/32×64/9=-3×2=-6
c)-5/8(-24/15)=3/3=1
4a)1/2+1/2+......+1/2= 1/2×20=10
b)(-1/2)+(-1/2)+......(-1/2)=20×(-1/2)=-10
