👤
Pascuciprian10
a fost răspuns

Determinati un nr stiindca

A) 3/4 din el este egal cu 15
B) 30% din el este egal cu 28
C ) 40% din el este egal cu 28

Răspuns :

[tex] \frac{3}{4} x=15=\ \textgreater \ 3x=15*4=\ \textgreater \ x=60:3=\ \textgreater \ x=20[/tex]

[tex] \frac{30}{100} x=28=\ \textgreater \ 30x=2800=\ \textgreater \ x=2800:30=\ \textgreater \ x=93,3[/tex]

[tex] \frac{40}{100} x=28=\ \textgreater \ 40x=2800=\ \textgreater \ x=2800:40=\ \textgreater \ x=70[/tex]
Andreeapba
3/4*x=15⇔3x/4=15⇔3x=15*4⇔3x=60⇔x=60:3⇔x=20
30/100*x=28⇔30x/100=28⇔30x=28*100⇔30x=2800⇔x=2800:30⇔x=93,(3)
40/100*x=28⇔40x/100=28⇔40x=2800⇔x=2800:40⇔x=70