4 1/5=4,2
(4,2-3,93)4,5=0,27*4,5=1,215
cosα = (a*b)/(|a|*|b|)
a*b = √2*(-3) + 2*0 - √2*3 = -6√2
|a| = √(2 + 4 + 2) = √8 = 2√2
|b| = √(9 + 0 + 9) = √18 = 3√2
cosα = -6√2/(2√2*3√2) = -6√2/6*2 = -√2/2
α = 135°
8+8=16 орехов ______________________________________
<span>(12:3+4)*5=40 (4+4)*5=40 8*5=40</span>