Răspuns :
21) a+b=36
a=bX2
=>3Xb=36
=>b=36:3=12
=>a=12X2=24
24)c+d=50
c=dX3+2
=>dX4+2=50
dX4=48
d=48:4=12
c=12X3+2=36+2=38
a=bX2
=>3Xb=36
=>b=36:3=12
=>a=12X2=24
24)c+d=50
c=dX3+2
=>dX4+2=50
dX4=48
d=48:4=12
c=12X3+2=36+2=38