5/19*38/25< x < 69 / 17+ 33/17
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\(a,\frac{50}{19}.\frac{38}{25}< x< \frac{69}{17}+\frac{33}{17}\)
\(4< x< 6\Rightarrow x=5\)
\(\frac{50}{19}.\frac{38}{25}< x< \frac{69}{17}+\frac{33}{17}\)
=> \(4< x< 6\)
=> x = 5
\(\frac{7}{15}< \frac{x}{40}< \frac{8}{15}\)
=> \(7.40< 15.x< 8.40\)
=> \(280< 15.x< 320\)
=> \(18< x< 22\)
=> \(x\in\left\{19;20;21\right\}\)
g) (15 + 37) + (52 – 37 – 17) = 15 + 37 + 52 – 37 – 17 = 15 + 52 – 17 = 50 h) (38 – 42 +14) - (38 – 42 - 15) = 38 – 42 +14 - 38 + 42 + 15 = 14 + 15 = 29 i) (27 + 65 ) + (346 - 27- 65) = 27 + 65 + 346 - 27- 65 = 346 k) - (27 + 65) - (346 – 27 - 65) = -27 - 65 - 346 + 27 + 65 = -346 l) (42 – 69 + 17) - (42 + 17) = 42 – 69 + 17 - 42 - 17 = – 69 m) 24. (16 - 5) – 16. (24 – 5 ) = 24. 16 - 24 . 5 - 16 . 24 + 16. 5 = - 24 . 5 + 16. 5 = -8 . 5 = -40 n) (-12). 47 – 12 . 52 + (-12) = -12 (47 - 52 + 1) = -12 . (-4) = 48 p) 51 . (69 - 25) – 69. (51 - 25) = 51 . 69 - 51 . 25 – 69. 51 + 69. 25 = - 51 . 25 + 69. 25 = (- 51+ 69).25 = 450 |
1)\(\frac{252}{x}=\frac{84}{97}\Rightarrow\)\(\frac{84}{97}=\frac{252}{291}\Rightarrow x=291\)
6) \(\frac{y}{15}=\frac{2}{5}\Rightarrow\frac{2}{5}=\frac{6}{15}\Rightarrow x=6\)
a) \(\frac{x-2}{255}=\frac{114}{153}\)
\(\Leftrightarrow\left(x-2\right)\cdot153=114\cdot255\)
\(\Leftrightarrow\left(x-2\right)\cdot153=29070\)
\(\Leftrightarrow x-2=190\)
\(\Leftrightarrow x=192\)
b) \(\frac{50}{19}\cdot\frac{38}{25}\le x\le\frac{69}{17}+\frac{33}{17}\)
\(\Leftrightarrow4\le x\le6\)
Vậy x =4 hoặc x=5 hoặc x=6
\(\dfrac{33}{38}:\dfrac{11}{19}=\dfrac{33\times19}{38\times11}=\dfrac{3\times1}{2\times1}=\dfrac{3}{2}\)
a,=3/13.17/29.29/34
=3/13.1/2
=3/26
b,=(4/21+25/42).19/33
=11/14.19/33
=19/42
`a, = 3/13 xx (17/29 xx 29/34)`
`= 3/13 xx 1/2`
`= 3/26`.
`b, = 19/33(4/21 + 25/42)`
`= 19/33 xx ( 33/42 )`
`= 19/42`
x = 1,2,3,4,5