ex 2 si 3 ca rog frumos dau coroana

Ex 2 Si 3 Ca Rog Frumos Dau Coroana class=

Răspuns :

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Vezi imaginea 102533
2.
a/b=2/3 =>2b=3a =>a=2b/3
a+b=135/10
a+b=27/2
2b/3 + b = 27/2
4b+6b=81
10b=81 =>b=8,1
a+8,1=13,5 =>a=5,4

3.
a-b=369/100
b/a=2/5 =>2a=5b =>a=5b/2
5b/2 - b = 369/100
250b-100b=369
150b=369 =>b=369/150=123/50 =>b=2,46
a-2,46=3,69 =>a=1,23