Răspuns :
a+b=3m;=300cm;
a=b+28cm
⇒b+28cm+b=300cm
⇒2b=300cm-28cm
⇒2b=272cm
⇒b=136cm;
⇒a=136cm+28cm
⇒a=164cm;
a=b+28cm
⇒b+28cm+b=300cm
⇒2b=300cm-28cm
⇒2b=272cm
⇒b=136cm;
⇒a=136cm+28cm
⇒a=164cm;
3m=300cm; x+y=300cm; x=y+28=>y+28+y=300<=>2y=300-28=> y=272÷2=>y=136cm;
x=y+28=>x=136+28=164cm.