Question

люди хелп ми плиз помогите (-5)-(+1/7) еще (-4/5)+(+2/5) и (-2)-(-6 2/3) и (-7/16)+(-6/16)

Answer 1

Вычислить.

$\big(-5\big) - \left(+\dfrac{1}{7}\right) = -5 - \dfrac{1}{7} = -\left(5 + \dfrac{1}{7}\right) = -5\dfrac{1}{7};\\\\\left(-\dfrac{4}{5}\right) + \left(+\dfrac{2}{5}\right) = -\dfrac{4}{5} + \dfrac{2}{5} = \dfrac{-4 + 2}{5} = \dfrac{-2}{5} = -\dfrac{2}{5};\\\\\big(-2\big) - \left(-6\dfrac{2}{3}\right) = -2 + 6\dfrac{2}{3} = 6\dfrac{2}{3} - 2 = 4\dfrac{2}{3};\\\\\left(-\dfrac{7}{16}\right) + \left(-\dfrac{6}{16}\right) = -\dfrac{7}{16} -\dfrac{6}{16} = -\left(\dfrac{7 + 6}{16}\right) = -\dfrac{13}{16}.$