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daca a/11=b/3 calculati 7a-2b/3a+5b

Răspuns :

a/11= b/3
3a=11b
a=11b/3
7a-2b/3a+5b= 7a-2b/ 16b= 7*11b/3 / 16b=77b/3-2b /16b= 71b/3*1/16b=71/48