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1 . a). 6/7 + ( 3 intregi si 4/5 * 15/38 - 4/9 * 6/8);
b). 2 intregi si 1/2 * (8 intregi si 2/3 - 4 intregi si 1/2 * 4/3);
c). 3/28 * (7/8 * 2 intregi si 2/3 + 3 intregi si 1/3 *2 intregi si 1/10);
d). [(1 intreg si 1/2 - 3/4)^2 - (3/4 - 1/2)^2] : (1 intreg - 5/6)^2;
e). 28/31 * [1/4 + (2 intregi si 1/2 - 7/4) : 7/8];
f). 12 intregi * (4 intregi si 1/6 + 2 intregi si 1/3 - 1 intreg si 2/12).




Răspuns :

a)6/7 + ( 3 intregi si 4/5 * 15/38 - 4/9 * 6/8)=6/4+19/5*15/38-4/9*6/8=
=6/7+3/2-1/3=6/7+9/6-2/6=6/7+7/6=85/42=2 intregi1/42
b)
2 intregi si 1/2 * (8 intregi si 2/3 - 4 intregi si 1/2 * 4/3)=8/2*(26/3-9/2*4/3)=5/2*(26/3-18/3)=5/2*8/3=20/3=6 intregi si 2/3
c)
3/28 * (7/8 * 2 intregi si 2/3 + 3 intregi si 1/3 *2 intregi si 1/10)=3/28*(7/8*8/3+10/3*21/10)=3/28(7/3+21/3)=3/28*28/3=1
d)[(1 intreg si 1/2 - 3/4)^2 - (3/4 - 1/2)^2] : (1 intreg - 5/6)^2=[(3/2-3/4)^2-(3/4-2/4)^2]:(6/6-5/6)^2=[(6/4-3/4)^2-(1/4)^2]:(1/6)^2=[(3/4)^2-(1/4)^2]:(1/6)^2=(9/16-1/16):(1/6)^=
15/16*6=15/96=5/32
e) 28/31 * [1/4 + (2 intregi si 1/2 - 7/4) : 7/8]=28/31*[1/4+(5/2-7/4):7/8] = 28/31*[1/4+(10/4-7/4)*8/7] = 28/31*(1/4+3/4*8/7) = 28/31*(1/4+6/7) = 28/31*(7/28+24/28) = 28/31*31/28 = 1
f). 12 intregi * (4 intregi si 1/6 + 2 intregi si 1/3 - 1 intreg si 2/12) = 12*(25/6+7/3-14/12) = 12*(25/6+14/6-14/12) = 12*(39/6-14/12) = 12*(78/12-14/12) = 12*64/12 = 64