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`-5,2 + 3,5 . (-5) - 6,9 : 3 + (0,2)^2`
`= -5,2 + (-17,5) - 2,3 + 0,04`
`= -22,7 - 2,3 + 0,04`
`= -25 + 0,04`
`= -24,96`
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1: =7/6:(-21/5)-25*0,2
=-7/6*5/21-5
=-35/126-5
=-5/21-5
=-5/21-105/21=-110/21
3: \(=\dfrac{7}{12}+\dfrac{5}{72}-\dfrac{11}{36}=\dfrac{42+5-22}{72}=\dfrac{25}{72}\)
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\(5,2^3+8.\left(11^2-120\right)\)
\(=140.608+8\left(1\right)\)
\(=148\)
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\(6,9-5x=3,2-1,2\cdot3\)
\(6,9-5x=3,2-3,6\)
\(6,9-5x=-0,4\)
\(5x=6,9-\left(-0,4\right)\)
\(5x=7,3\)
\(x=7,3:5\)
\(x=1,46\)
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\(a,5,2x+7\dfrac{2}{5}=6\dfrac{3}{4}\\ \Rightarrow\dfrac{26}{5}x+\dfrac{37}{5}=\dfrac{27}{4}\\ \Rightarrow\dfrac{26}{5}x=-\dfrac{13}{20}\\ \Rightarrow x=-\dfrac{1}{8}\\ b,2,4:\left(\dfrac{-1}{2}-x\right)=1\dfrac{3}{5}\\ \Rightarrow\dfrac{12}{5}:\left(\dfrac{-1}{2}-x\right)=\dfrac{8}{5}\\ \Rightarrow\dfrac{-1}{2}-x=\dfrac{3}{2}\\ \Rightarrow x=-2\)
- 5,2 + 3,5 . - 2 - 6,9 : 3 + -0,22
=-5,2 - 7 -2,1 - 0,22
=-12,2-2,1-0,22
=-14,3-0,22
=-14,52
= -5,2 + (-7) - 2,3 + 0,04
= -12,2 - 2,3 + 0,04
= -14,5 + 0,04
= -14,46