Question

Выполните умножение:
а)
$2.3 \times ( - 3)$
б)
$- 7.2 \times ( - 0.8)$
в)
$\frac{2}{9} \times ( - 12)$
г)
$- \frac{8}{15} \times ( - \frac{25}{28} )$
д)
$- 4 \frac{2}{3} \times \frac{6}{35}$

Answer 1

а) $2.3*(-3)=-6.9$
б) $-7.2*(-0.8)= \frac{72}{10}* \frac{8}{10}= \frac{576}{100}= 5.76$
в) $\frac{2}{9} * (-12) = \frac{-24}{9} = - \frac{8}{3} = -2 \frac{2}{3}$
г) $-\frac{8}{15} * -\frac{25}{28} = \frac{8*25}{28*15}= \frac{200}{420}= \frac{20}{42}= \frac{10}{21}$
д) $-\frac{14}{3}* \frac{6}{35} = - \frac{14*6}{3*35} = - \frac{84}{105} = - \frac{4}{5} = -0.8$

Answer 2

2,3*(-3)=-(2,3*3)=-6,9
7,2*(-0,8)=-(7,2*0,8)=-5,76
2/9*(-12)=-2/3*4=-8/3
-8/15*(-25/28)=2/3*5/7=10/21
-4 2/3*6/35=-14/3*6/35=-2*2/5=-4/5