Question

5.scoateti factor comun si calculati

Answer 1

a)-0,2•3,8 -3,7•(-0,2)=

-0,2 factor comun

=-0,2(3,8-3,7)=-0,2•0,1=-0,02

b)

$\frac{2}{3} \times ( - 1.57) + \frac{2}{3} \times (1.43)$

2/3 factor comun

$\frac{2}{3} ( - 1.57 - 1.43) = \\ = \frac{2}{3} \times ( - 3) = - \frac{6}{3} = - 2$

c) -2/7 factor comun

$- \frac{2}{7} (\frac{3}{8} + \frac{5}{8} ) = \\ = - \frac{2}{7} \times \frac{8}{8} = - \frac{2}{7}$

d) -27/28 factor comun

$- \frac{27}{28} (3 \frac{2}{3} - 2 \frac{4}{9} + 1 \frac{1}{2} )$

calculează tu ....

e)4/13 factor comun

$\frac{4}{13} ( - \frac{3}{19} - \frac{5}{19} + \frac{11}{19} ) = \\ = \frac{4}{13} \times \frac{3}{19} = \frac{12}{247}$