Question

Coroana pt tine +30 de puncte este foarte urgentttttttttt (doar testul 1)

Answer 1

1. a. 2/10*5/7+11/14=1/5*5/7+11/14=1/7+11/14=2/14+11/14=13/14=0.928

b. 5/3*12/5-4/3=12/3-4/3=8/3=2.(6)

c. (4/9)/(3/2)=(4/9)*(2/3)=8/27=0.296

d. 0.(6)/0.6-2/3=(2/3)/(6/10)-2/3=(2/3)*(10/6)-2/3=10/9-2/3=10/9-6/9=4/9=0.(4)

2.  a. (-2)*(-4+4)=0

b. (-4)*(-5+4)=(-4)*(-1)=4

c. (-8)/(-8)+(-1)=1-1=0

d.   -3+2*(-3+1)=(-3)+2*(-2)=(-3)+(-4)=(-7)

3.  a. -7v3+11v3+2v3-3v3=3v3=5.196  ;   v3= radical din 3 ;

b. 2v18+3v27-2v75=6v2+9v3-10v3=6v2-v3=8.845-1.732=7.113

c. v7*(-1/v7)=(-1)

d. 2v3*(4v2-8v2)=2v3*(-4v2)=(-8v6)=(-19.595)

e. (-3v3)*((3+2v3*v3)/v3)=(-3v3)*(9/v3)=(-27)

f. 4/4v2+6/4v2-5/4v2=5/4v2=1.25*v0.5=0.88

4. a. (2v3-3)(v3+1)=2v3*v3+2v3-3v3-3=6-3-v3=3-v3=1.267

b. (3v3-4)(3v3+4)=27+12v3-12v3-16=11

c. (v2+1)(v2+1)+4v2=2+v2+v2+1+4v2=3+6v2=11.485

d. (v5-2)(v5-2)+4v5-4=5-2v5-2v5+4+4v5-4=5

5. (1/(v4+v3))+(1/(v3+v2))+(1/(v2+v1)) =1/3.732+1/(1.732+1.412)+1/2.414=0.267+1/3.144+0.414=0.681+0.318=0.999  

sau

1/(2+v3)+1/(1+v2)+1/(v2+v3)=(1+v2+2+v3)/((2+v3)(1+v2))+1/(v2+v3)=(3+v2+v3)/(2+2v2+v3+v6)+1/(v2+v3)=((v2+v3)(3+v2+v3)+2+2v2+v3+v6)/((v2+v3)(2+2v2+v3+v6))=(3v2+2+v6+3v3+v6+3+2+2v2+v3+v6)/(2v2+4+v6+2v3+2v3+2v6+3+3v2)=(7+5v2+4v3+2v6)/(7+5v2+4v3+3v6)=aproximativ 1=(14.071+6.928+4.898)/(14.071+6.928+4.898+2.449)=25.897/28.346=0.913