Question

20. Determină termenul nec
mină termenul necunoscut din proportiile următoare: va rog le aveți in imagini ex 20

Answer 1

Răspuns:

a) 7d= $\frac{6}{10} *\frac{5}{3}$   7d= $\frac{2}{2}$   7d=1 => d= 1/7

b) c*$\frac{12+1}{3}$= $\frac{3}{9} *\frac{25}{10}$   c*$\frac{13}{3} = \frac{1}{3} * \frac{5}{2}$  => c= $\frac{5}{6} *\frac{3}{13}$= $\frac{5}{26}$

c) $\frac{x}{3} = 4*\frac{6+1}{3}$   $\frac{x}{3} = \frac{4*7}{3}$  x= $\frac{28*3}{3}$   x= 28

d) x= $\frac{4.5*0.4}{1.2*0.5}$= $\frac{9}{3}$= 3

e) 2,(3)= $\frac{23-2}{9}= \frac{21}{9} = \frac{7}{3}$     0,1 (6)= $\frac{16-1}{90} = \frac{15}{90} =\frac{1}{6}$

13x= $\frac{13}{10} *\frac{1}{6} *\frac{7}{3}$       13x= $\frac{13}{14*10}$   x= $\frac{14*10*13}{13}$ = 14*10= 140