Question

сократите дробь 7b - 14b^242b^2-21b

Answer 1

$frac{7b-14b^{2} }{42b^{2}-21b } =frac{7b(1-2b)}{21b(2b-1)} =frac{1-2b}{3(2b-1)} =-frac{2b-1}{3(2b-1)} =-frac{1}{3}$