3) 65
т.к. мщность 219 л.с., смотри по таблице
(1/4+0.31)*3=1.68
1) 1/4+0.31=25/100+0.31=0.25+0.31=0.56
2) 0.56*3=1.68
(1/4+0.31)*3=1,68
1) 1/4+0.31=1/4+31/100=25/100+31/100=56/100
2)56/100*3=56/100*3/1=168/100=1 68/100=1,68
64a³-27b⁶=(4a)³-(3b²)³=(4a-3b²)((4a)²+(4a)*(3b²)+(3b²)²=
=(4a-3b²)(16a²+12ab²+9b⁴)
(3n+2)³+(4n+5)³= (3n+2+4n+5)((3n+2)²-(3n+2)(4n+5)+(4n+5)²)=
=(7n+7)((3n+2)²-(3n+21)(4n+5)+(4n+5)²)=
=7(n+1)((3n+2)²-(3n+2)(4n+5)+(4n+5)²).
Раскрыть скобки
3x+5+8x+1=17
Решить
3x+8x=17-5-1
11x=11
x=11:11
x=1