3a×(-8); 2)-5×3/10b; 3)-7c×(-3d); 4)-8c×(-3/4b); 5) 10m×(-0*5n); 6)-9th ×(-2/3n)

Найдем значения выражений: 3a × (-8) = 3 × (-8)a = - 24a ; 2)-5 × 3/10b = b ( - 5 × 3 )/10 = b ( - 1 × 3 )/2 = - (3/2)b = - 1 целая 1/2b; 3) -7c × (-3d) = ( - 7 × (-3)) cd = 21cd ; 4) -8c × ( -3/4b ) = ( -8 × ( -3/4))cb = cb( - 8 × ( -3))/4 = cb ( - 2 × ( -3))/1 = cb × (- 6) = - 6 cb; 5) 10m × (-0,5n) = 10 × (-0,5)mn = -5 mn ; 6) -9th × ( -2/3n) = -9 × ( -2/3)thn = (-9 × (-2))/3thn = (3 × 2)nth = 6nth.