<span>переведите 4058дм 9мм в миллиметры 1 дм = 10 см = 100 мм </span>
<span>4058 дм = 40580 см = 405 800 мм </span>
<span>405 800 мм + 9 мм = 405 809 мм </span>
![f(x,y,z)=\sqrt zx^y\\\frac{\partial f}{\partial x}=yx^{y-1}\sqrt z\\\frac{\partial f}{\partial y}=x^y\ln x\sqrt z\\\frac{\partial f}{\partial z}=\frac{x^y}{2\sqrt z}](https://tex.z-dn.net/?f=f%28x%2Cy%2Cz%29%3D%5Csqrt+zx%5Ey%5C%5C%5Cfrac%7B%5Cpartial+f%7D%7B%5Cpartial+x%7D%3Dyx%5E%7By-1%7D%5Csqrt+z%5C%5C%5Cfrac%7B%5Cpartial+f%7D%7B%5Cpartial+y%7D%3Dx%5Ey%5Cln+x%5Csqrt+z%5C%5C%5Cfrac%7B%5Cpartial+f%7D%7B%5Cpartial+z%7D%3D%5Cfrac%7Bx%5Ey%7D%7B2%5Csqrt+z%7D)
Правильный только один - производная по z.
![u=xy^2+z^2+5x\\\frac{\partial u}{\partial x}=y^2+5\\\frac{\partial u}{\partial y}=2xy\\\frac{\partial u}{\partial z}=2z\\grad(u)_M=(y^2+5)\bar i+2xy\bar j+2z\bar k=(0+5)\bar i+2\cdot(-1)\cdot0\bar j+2\cdot1\bar k=\\=5\bar i+2\bar k](https://tex.z-dn.net/?f=u%3Dxy%5E2%2Bz%5E2%2B5x%5C%5C%5Cfrac%7B%5Cpartial+u%7D%7B%5Cpartial+x%7D%3Dy%5E2%2B5%5C%5C%5Cfrac%7B%5Cpartial+u%7D%7B%5Cpartial+y%7D%3D2xy%5C%5C%5Cfrac%7B%5Cpartial+u%7D%7B%5Cpartial+z%7D%3D2z%5C%5Cgrad%28u%29_M%3D%28y%5E2%2B5%29%5Cbar+i%2B2xy%5Cbar+j%2B2z%5Cbar+k%3D%280%2B5%29%5Cbar+i%2B2%5Ccdot%28-1%29%5Ccdot0%5Cbar+j%2B2%5Ccdot1%5Cbar+k%3D%5C%5C%3D5%5Cbar+i%2B2%5Cbar+k)
47,23+32,669,46-0,452)47,23+(32,77-16,11)3)(46,83+15,17)-(16,83-4,02)
aptem228
47.23+32.66=79.89
9.46-0.45=9.01
47.23+(32.77-16.11)=47.23+16.66=63.89
(46.83+15.17)-(16.83-4.02)=62.00-12.81=49.19
150•3=450
120•3=360
450+360=810(булочек)
Или
150+120=270
270•3=810(булочек)
1.
6907+43493=50400
50400:60=840
Ответ: неизвестное число - 840
2.
7621-7571=50
40450×50=2022500
Ответ: неизвестное число 2022500