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a+b=(a-b)×3 (a+b):b=?

Răspuns :

a + b = ( a - b)×3
a + b = 3×a -3×b
b + 3×b = 3×a - a
4×b = 2×a |:2
2×b = a
a = 2×b
(a + b):b = ( 2×b +b):b = 3×b :b = 3