<span>1,7<</span><span>√3</span><span><1,8</span>
<span>1) 1.7*3<3√3<1.8*3</span>
<span>5.1<3√3<5.4</span>
<span>2) 1.7*2<2√3<1.8*2</span>
<span>3.4<2√3<3.6</span>
<span>5-3.4>5-2√3>5-3.6</span>
<span>1.6>5-2√3>1.4</span>
Так. 480:20=24. 24+20=44(с) товарного поезда
1)
a)-9/10
б)24/36
2)
a)-7,1
б)0
1) 4х+2х²=4-х²
2х²+х²+4х-4=0
3х³+4х-4=0
D=16+48=64
х₁= -4-8 / 6 = -2
х₂= -4+8 / 6 = 2/3
Ответ: х= -2; 2/3
2) 1/2 х² - 2х-6=0
х²-4х-12=0
D=16+48=64
х₁ = 4-8 / 2 = -2
х₂ = 4+8 / 2 = 6
Ответ: х= -2; 6
3) 9х²=25
х² = 25/9
х₁ = -5/3 = -1 2/3
х₂ = 5/3 = 1 2/3
Ответ: х= -1 2/3; 1 2/3