Question

4 a) &b) va rogg repede
10 puncte​

Answer 1

Răspuns:

Explicație pas cu pas:

a) a=1-√2/2+1/2-√2/4+1/4-√2/8     (acum aducem peste tot la numitor cu 8)

a=(8-4√2+4-2√2+2-√2)/8

a=(-7√2+14)/8

a=7(2-√2)/8

b) b=(6/9+7/3) : (1+2√3+3-4)/2

b=(27/9) : (2√3)/2

b=27/9 : √3

b=27/9√3

b=3/√3

b=3√3/3

b=√3

(2+√2)*a=√3*b-5/4

(2+√2)*(14-7√2)/8 = √3 * √3 - 5/4

(28-14√2+14√2-14)/8 = 3 - 5/4

14/8 = 3 - 5/4

14/8 = (12-5)/4

7/4 = 7/4 (A)