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21 si 24 ma ajuta cineva

21 Si 24 Ma Ajuta Cineva class=

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
21.a+b=36
a=2b
2b+b=36
3b=36
b=36:3=12
a=2b
a=2x12=24