Question

Repede va rog!Am nevoie urgent ! Dau 40 de puncte

Answer 1

Răspuns:

a) $\frac{a}{19} + \frac{11a}{19} +\frac{7a}{19}$= $\frac{a+11a+7a}{19} = \frac{19a}{19}$= a   ( se adună numărătorii deoarece fractiile au același numitor 19)

b) $\frac{3a+17a+ 26a}{23}$= $\frac{46a}{23} = 2a$

c) $\frac{11x+13x+25x}{49}$= $\frac{24x+25x}{49} = \frac{49x}{49}$= x

d) $\frac{15b-3b- 5b}{7} = \frac{15b-8b}{7}$= $\frac{7b}{7} =b$

e) $\frac{21y-7y-3y}{11}$= $\frac{11y}{11}$= y

f) $\frac{29c- 21c -8c }{47}$= $\frac{0c}{47} =0$

a) $\frac{1}{2} + \frac{5}{4} =$$\frac{2*1+5}{4} = \frac{2+5}{4} =\frac{7}{4}$   se aduce la acelasi numitor 4

b) $\frac{1}{9} + \frac{3}{7} =$$\frac{7*1+3*9}{7*9}$= $\frac{7+27}{63}$= $\frac{34}{63}$   se aduce la acelasi numitor 63

c)$\frac{8*1+3*6}{48}$= $\frac{8+18}{48}$= $\frac{26}{48}$= $\frac{13}{24}$  

d)$\frac{10*13+9}{117}$= $\frac{130+9}{117}$= $\frac{139}{117}$