Question

помогите пажалуйста номер3. надеюсь на вас!

Answer 1

а.
     -2 5/8 :1 3/4+( - 8,7-( -2,3)) :0,8-2 2/9*( -0,6)= - 6
1)  -2 5/8 :1 3/4= -21/8*4/7= -3/2
2)  - 8,7+2,3= -6,4
3)  -6,4:0,8= -8
4)  -3/2+( -8)= -1 1/2-8= -9 1/2
5)  2 2/9*( -0,6)= - 20/9*6/10= - 6/3= - 2
6)  -8-( - 2)=-8+2= - 6

б.
$\frac{6 \frac{2}{3}*(-4,2)*(-0,09) }{5,6*(-3 \frac{1}{8})*1,2 } =- \frac{ \frac{20}{3}* \frac{21}{5}* \frac{9}{100}}{ \frac{18}{5}* \frac{25}{8}* \frac{6}{5}}=- \frac{ \frac{63}{25}}{ \frac{9}{2}}=- \frac{63}{25}* \frac{2}{9}=- \frac{14}{25}$