1)
2) 0,38^2+1.42*0.38+1.8*4.62 = 0.38*(0.38+1.42)+1.8*4.62 = 0.38*1.8+1.8*4.62 = 1.8(0.38+4.62)=1.8*5=9
1. 4 - x = 0; x = 4
2. x + 6 = 0; x = -6
3. x - 5 = 0; x = 5
(x ⩾ 5)!
ОТВЕТ: 5
2x^2+12x-14=0; D=12^2-4*2*(-14)=144+112=256; x1=(-12-16)/4, x2=(-12+16)/4. x1= -7, x2=1. Ответ: x1= -7, x2=1.
2cos^2(x)-7cos(x)=2sin^2(x)