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PLZZZ URGENTTTTT!!!!!!! ​

PLZZZ URGENTTTTT class=

Răspuns :

Răspuns:

a+b=300

a-80=b/2

a=b/2 + 80

a+b=300

b/2+80+b=300 | ×2

b+160+2b=600

3b=600-160

b=440

a=b/2+80

a=440/2+80=220+80

a=300

Explicație pas cu pas: