Question

Упростите:
a) -4с * 3d
б) -0,2a *(-3,1b)
в) 7/8 (-4/9) * 2/7x

Answer 1

-12cd
0,62ab
$- \frac{7 \times 4 \times 2}{8 \times 9 \times 7} x = - \frac{56}{504} x = - \frac{14}{126} x = - \frac{7}{63} x = - \frac{1}{9} x = - \frac{x}{9}$

Answer 2

a) -4с * 3d=-12сd
б) -0,2a *(-3,1b)=0,62ab
в) 7/8 (-4/9) * 2/7x=-1/9x
7/8*2/7x=2/8x=1/4x
1/4x*(-4/9)=-1/9x