Question

calculați numărul necunoscut am proporției:x/7=15/21;30/1=15/x;
dau fundița

Answer 1

x/7=15/21 ⇒ x =7·15/21 =5

30/1=15/x⇒  x=15·1/30 =1/2=0,5

Answer 2

 [tex] \frac{X}{7} = \frac{15}{21} ~SIMPLIFICAM~PRIN~3: \frac{x}{7} = \frac{5}{7} \\\\ DIN~PROPORTIA~NOU~OBTINUTA~AFLAM~X-UL\\ X=(7*5):7~SIMPLIFICAM~PRIN~7~SI~AVEM:X=5\\\\ 30= \frac{15}{X} =\ \textgreater \ X=15:30~SIMPLIFICAM~PRIN~15\\\\ SI~OBTINEM~CA~X= \frac{1}{2} [/tex]