3) [tex] 7* \frac{2}{3} +4* \frac{9}{5} = \frac{14}{3} + \frac{36}{5} = \frac{178}{15} =11 \frac{13}{15} [tex] =11,8(6)7
5) [tex] (x+2 \frac{8}{15} )* \frac{3}{2} =5 \frac{1}{4} =(x+ \frac{38}{15} )* \frac{3}{2}= \frac{21}{4} inmultesti termeni din paranteza cu \frac{3}{2} = \frac{3}{2} x+ \frac{19}{5} = \frac{21}{4} |*20 [tex] =30x+76=105 = 30x=29|:30= x[tex] \frac{29}{30} [/tex]= 0,9(6)7
scuze dar pe 4 nu stiu sa il fac! sper ca ti-am fost de ajutor
