1) 7,6 +5,85=13,45
2) 10,9-4,86=6,04
3)13,45 × 6,04=81,238
![81^\frac{1}{4}-(3\sqrt3)\cdot2=\sqrt[4]{81}-6\sqrt3=\sqrt[4]{3^4}-6\sqrt3=3-6\sqrt3=3(1-2\sqrt3)](https://tex.z-dn.net/?f=81%5E%5Cfrac%7B1%7D%7B4%7D-%283%5Csqrt3%29%5Ccdot2%3D%5Csqrt%5B4%5D%7B81%7D-6%5Csqrt3%3D%5Csqrt%5B4%5D%7B3%5E4%7D-6%5Csqrt3%3D3-6%5Csqrt3%3D3%281-2%5Csqrt3%29)
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![81^\frac{1}{4}-(3\sqrt3)^2=\sqrt[4]{81}-3^2\cdot(\sqrt3)^2=\sqrt[4]{3^4}-9\cdot3=3-27=-24](https://tex.z-dn.net/?f=81%5E%5Cfrac%7B1%7D%7B4%7D-%283%5Csqrt3%29%5E2%3D%5Csqrt%5B4%5D%7B81%7D-3%5E2%5Ccdot%28%5Csqrt3%29%5E2%3D%5Csqrt%5B4%5D%7B3%5E4%7D-9%5Ccdot3%3D3-27%3D-24)
1-1/3=3/3-1/3=2/3
1-3/4=4/4-3/4=1/4
1-11/20=20/20-11/20=9/20
1-7/10=10/10-7/10=3/10
1-16/17=17/17-16/17=1/17
93:3=31(л)-Молока в 1 бидоне. 31*5=155(л)Молока в 5 бидонах