Question

Matematică:clasa a 7a
Efectuează: 1-1/2÷(1-1/2)÷[-1/5+(-4)×(1/3+1/3÷(-2))]+1/13

Answer 1

$1-\frac{1}{2}\div \left(1-\frac{1}{2}\right)\div \:\left[-\frac{1}{5}+\left(-4\right)\times \left(\frac{1}{3}+\frac{1}{3}\div \left(-2\right)\right)\right]+\frac{1}{13}=$

$1-\frac{1}{2}\div \frac{1}{2}\div \:\left[-\frac{1}{5}+\left(-4\right)\times \left(\frac{1}{3}+\frac{1}{3}\div \left(-2\right)\right)\right]+\frac{1}{13}=$

$\left[-\frac{1}{5}+\left(-4\right)\times \left(\frac{1}{3}+\frac{1}{3}\div \left(-2\right)\right)\right] = -\frac{1}{5}+\left(-4\right)\times \left(\frac{1}{3}+\frac{1}{3}\div \left(-2\right)\right) =-\frac{1}{5}+\left(-4\right)\times \frac{1}{6} = -\frac{1}{5}-\frac{2}{3} =$$-\frac{13}{15}$

$1-\frac{1}{2}\div \frac{1}{2}\div \left(-\frac{13}{15}\right)+\frac{1}{13} =$

$1-\left(-\frac{15}{13}\right)+\frac{1}{13} = 1+\frac{15}{13}+\frac{1}{13} = \frac{28}{13}+\frac{1}{13}= \frac{29}{13}$

Answer 2

Răspuns:

Intreaga rezolvare este in imaginile atasate! Succes! :)