1) (8*11)+(15*6)=178
2) 1602:178=9
Ответ: 9 часов
<span>(b^2-4)/(b-3) ÷ (B^2+4b+4)/(b-3)
= </span>(b-4)(b+4)/(b-3) ÷ (b+4)(b+4)/(b-3)
= (b-4)(b+4)/(b-3) * (b-3)/(b+4)(b+4)
= (b-4) * 1/(b+4)
= (b-4) / (b+4)
<span>3-5x/5+3x-5/3+6x+7/15=3x-2/1
(3(3-5х)+5(3х-5)+6х+7)/15=3х-2
</span>(9-15х+15х-25+6х+7)/15-3х=-2
(6х-9)/15-45х/15=-2
(6х-9-45х)/15=-2
-39х-9=-2*15
-39х=-30+9
-39х=-21
х=-21:(-39)
х=21/39
1. 49.354; 49.354-3.509=45.845
2. 44.157; 44.157+6.945=50.102
3. 29.224; 29.224:4=7.306
4. 14.590; 14.590*6=87.540