384=3000+80+4
сразу пожалуйста
(634.100-17.300):300= 2,056 т.к.
1)первое действие всегда в скобках!(634,100 – 17,300) = 616,8
2)616,8 / 300<span> = </span><span>2,056</span>
1. В параллелепипеде верны следующие равенства:
![\vec{AB}=\vec{A_1B_1}=\vec{DC}=\vec{D_1C_1}\\\vec{BC}=\vec{B_1C_1}=\vec{AD}=\vec{A_1D_1}\\\vec{AA_1}=\vec{BB_1}=\vec{DD_1}=\vec{CC_1}\\](https://tex.z-dn.net/?f=%5Cvec%7BAB%7D%3D%5Cvec%7BA_1B_1%7D%3D%5Cvec%7BDC%7D%3D%5Cvec%7BD_1C_1%7D%5C%5C%5Cvec%7BBC%7D%3D%5Cvec%7BB_1C_1%7D%3D%5Cvec%7BAD%7D%3D%5Cvec%7BA_1D_1%7D%5C%5C%5Cvec%7BAA_1%7D%3D%5Cvec%7BBB_1%7D%3D%5Cvec%7BDD_1%7D%3D%5Cvec%7BCC_1%7D%5C%5C)
следовательно
![\vec{AB}+\vec{B_1C_1}+\vec{DD_1}+\vec{CD}=\vec{AB}+\vec{BC}+\vec{CD}+\vec{DD_1}=\vec{AD_1}\\\\\vec{BD_1}-\vec{B_1C_1}=\vec{BD_1}-\vec{BC}=\vec{CD_1}](https://tex.z-dn.net/?f=%5Cvec%7BAB%7D%2B%5Cvec%7BB_1C_1%7D%2B%5Cvec%7BDD_1%7D%2B%5Cvec%7BCD%7D%3D%5Cvec%7BAB%7D%2B%5Cvec%7BBC%7D%2B%5Cvec%7BCD%7D%2B%5Cvec%7BDD_1%7D%3D%5Cvec%7BAD_1%7D%5C%5C%5C%5C%5Cvec%7BBD_1%7D-%5Cvec%7BB_1C_1%7D%3D%5Cvec%7BBD_1%7D-%5Cvec%7BBC%7D%3D%5Cvec%7BCD_1%7D)
2.
![\vec{BN}=\vec{BD}+\vec{DN}=\vec d +\frac{1}{2}\vec{DS}=\vec d+\frac{1}{2}(\vec{BS}-\vec{BD})=\\=\vec d+\frac{1}{2}\vec{BS}-\frac{1}{2}\vec d=\frac{1}{2}\vec d+\frac{1}{2}(\frac{1}{2}(\vec{BA}+\vec{BC}))=\frac{1}{2}\vec d + \frac{1}{4}\vec a + \frac{1}{4}\vec c](https://tex.z-dn.net/?f=%5Cvec%7BBN%7D%3D%5Cvec%7BBD%7D%2B%5Cvec%7BDN%7D%3D%5Cvec%20d%20%2B%5Cfrac%7B1%7D%7B2%7D%5Cvec%7BDS%7D%3D%5Cvec%20d%2B%5Cfrac%7B1%7D%7B2%7D%28%5Cvec%7BBS%7D-%5Cvec%7BBD%7D%29%3D%5C%5C%3D%5Cvec%20d%2B%5Cfrac%7B1%7D%7B2%7D%5Cvec%7BBS%7D-%5Cfrac%7B1%7D%7B2%7D%5Cvec%20d%3D%5Cfrac%7B1%7D%7B2%7D%5Cvec%20d%2B%5Cfrac%7B1%7D%7B2%7D%28%5Cfrac%7B1%7D%7B2%7D%28%5Cvec%7BBA%7D%2B%5Cvec%7BBC%7D%29%29%3D%5Cfrac%7B1%7D%7B2%7D%5Cvec%20d%20%2B%20%5Cfrac%7B1%7D%7B4%7D%5Cvec%20a%20%2B%20%5Cfrac%7B1%7D%7B4%7D%5Cvec%20c)
3.
![\vec{MT}=\vec{MN}+\vec{NT}=-\vec{NM}+\frac{1}{2}\vec{NC}=-\vec c+\frac{1}{2}(\vec{NM}+\vec{MC})=\\=\frac{1}{2}\vec{MC}-\frac{1}{2}\vec c=\frac{1}{2}(\frac{2}{3}(\vec{MN}+\frac{1}{2}(\vec{NL}+\vec{NK})))-\frac{1}{2}\vec c=\frac{1}{6}\vec a + \frac{1}{6}\vec b-\frac{1}{6}\vec c](https://tex.z-dn.net/?f=%5Cvec%7BMT%7D%3D%5Cvec%7BMN%7D%2B%5Cvec%7BNT%7D%3D-%5Cvec%7BNM%7D%2B%5Cfrac%7B1%7D%7B2%7D%5Cvec%7BNC%7D%3D-%5Cvec%20c%2B%5Cfrac%7B1%7D%7B2%7D%28%5Cvec%7BNM%7D%2B%5Cvec%7BMC%7D%29%3D%5C%5C%3D%5Cfrac%7B1%7D%7B2%7D%5Cvec%7BMC%7D-%5Cfrac%7B1%7D%7B2%7D%5Cvec%20c%3D%5Cfrac%7B1%7D%7B2%7D%28%5Cfrac%7B2%7D%7B3%7D%28%5Cvec%7BMN%7D%2B%5Cfrac%7B1%7D%7B2%7D%28%5Cvec%7BNL%7D%2B%5Cvec%7BNK%7D%29%29%29-%5Cfrac%7B1%7D%7B2%7D%5Cvec%20c%3D%5Cfrac%7B1%7D%7B6%7D%5Cvec%20a%20%2B%20%5Cfrac%7B1%7D%7B6%7D%5Cvec%20b-%5Cfrac%7B1%7D%7B6%7D%5Cvec%20c)
319488:96=3328
3328:16=208
так что 319488:96:16<505