Question

Раскройте скобки
1) 3/7b(-14t-7/9y+2 1/3c)
2)-1.2xy(5m-6c+1/6t-5/6)
3)0.3mn(1.5-6bc+7b-10c)

Answer 1

$1)~ \frac{3}{7} (-14t-\frac{7}{9}y+2\frac{1}{3} c)=\frac{3}{7} (-14t-\frac{7}{9}y +\frac{7}{3} c)=-6t-\frac{y}{3} +c$

$2)~-1.2xy(5m-6c+\frac{1}{6} t-\frac{5}{6} )=-6xym+7.2c-0.2t+1$

$3)~0.3mn(1.5-6bc+7b-10c)=0.45mn-1.8mnbc+2.1mnb-3mnc$