X-3-4x-4=20-5x-1
-3x-7=19-5x
-3x+5x=19+7
2x=26
x=26:2
x=13
-3*k+11=-4⇒3*k=11+4=15=3*k⇒k=5.
Ответ: k=5.
8дм3=8000см3
62дм3=62000см3
378000мм3=378см3
520000мм3=520см3
78дм3 325см3=78325см3
56дм3 14см3=56014см3
8м3 4дм3 6см3= 8004006см3
Р(12<X<14)=1/2(Ф(х2)-Ф(х1))
![x_2= \frac{14-10}{2 \sqrt{2} } = \sqrt{2}=1.4](https://tex.z-dn.net/?f=x_2%3D+%5Cfrac%7B14-10%7D%7B2+%5Csqrt%7B2%7D+%7D+%3D+%5Csqrt%7B2%7D%3D1.4+)
![x_1= \frac{12-10}{2 \sqrt{2} } = \sqrt{2}/2=0.7](https://tex.z-dn.net/?f=x_1%3D+%5Cfrac%7B12-10%7D%7B2+%5Csqrt%7B2%7D+%7D+%3D+%5Csqrt%7B2%7D%2F2%3D0.7+)
Р(12<X<14)=1/2(Ф(1.4)-Ф(0.7))=0.5(0.9523-0.6728)=0.13975