9*sin120°*tg30° = 9*sin(90°+30°)*tg30° = <span>9*cos30</span>°<span>*(sin30</span>°<span>/cos30</span>°<span>) = 9*sin30</span>° = 9*0.5 <span>= 4.5</span>
Если эти квадраты равны , тогда 2+a
1)13,5*9,1=122,85
2)122,85*(-3,3)=-405,405
3)-405,405:(-0,00013)=3118500
18x²-(18x²-9x+4x-2)=1
18x²-18x²+9x-4x+2-1=0
5x+1=0
5x=-1
x=-1/5
x=-0,2