Question

Vă rog ajutațimă PLS

Answer 1

Răspuns:

1. x+ 6.5= 74.5   x= 74,5- 6,5= 68

2. 3a - $\frac{10*4+7}{10}$= 4.7       3a= 4,7+ $\frac{47}{10}$    3a= 4,7+ 4,7= 9,4

a= 9,4:3= 3,1(3)

3. M= (6,2+6,3):2= 12,5:2= 6.25

a: $\frac{15}{2}$= 6,25     a:7,5 = 6,25  a= 6,25* 7,5= 46,875

7. a) x= $\frac{7-2}{3}$= 5/3         c) $\frac{5*3-2}{35}$= x    x= $\frac{13}{35}$

b) x= $\frac{4-3}{7} = \frac{1}{7}$      d)  x= $\frac{7*3+1}{7} - \frac{5*2+1}{5}$ = $\frac{22}{7}$ - $\frac{11}{5}$ = $\frac{5*22- 7*11}{35}$= $\frac{33}{35}$

8. a) 4x=8 => x= 8:4=2  x=2     b) 4x=2 => x= 2/4= 1/2

c) x= $\frac{4}{9} * \frac{3}{2}$= $\frac{2}{3}$     d) $\frac{5x}{7} =1$  => x= $\frac{7}{5}$

9. a) x = $\frac{5}{7} :10$= $\frac{5}{7} * \frac{1}{10}$= $\frac{1}{14}$

b) x= $\frac{3}{11} * \frac{1}{15}$= $\frac{1}{55}$      c) x= $\frac{17*2+1}{2} : \frac{3*2+1}{2}$ = $\frac{35}{2} *\frac{2}{7}$= 5

10.  a) x= $\frac{11-3}{5} = \frac{8}{5}$     b) x= $\frac{12}{17} - \frac{15}{34} = \frac{2*12- 15}{34}$= $\frac{9}{34}$

f) x= 7- $\frac{3*4+2}{3}$= $\frac{7*3- 14}{3}$= $\frac{7}{3}$