17/15 + x= 5/11 + 17/11
giúp mình nhé! mình dag vội !
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Chị ơi tìm gì đấy ạ chị noi thế có bố em cũng chả giải được
a.|x-1|=3
=>x-1=3 hoặc x-1=-3
=>x=4 hoăc x=-2
vậy...
b.2x+17=15
=>2x=15-17
=>2x=-2
=>x=-1
vậy...
c.tự giải
d.4x-15=-75-x
=>4x+x=-75+15
=>5x=-60
=>x=-12
vậy...
2.2+(-3)+4+...+(-2011)+2012
=(-3+2)+...+(-2011+2010)+2012 (có 2010 cặp)
=-1.2010+2012
=-2010+2012=2
9/11 x 10/13 + 9/13 x 12/11 - 7/11
= 9/13 x 10/11 + 9/13 x 12/11 - 7/11
= 9/13 x (10/11 + 12/11) - 7/11
= 9/13 x 22/11 - 7/11
= 9/13 x 2 - 7/11
= 18/13 - 7/11
= 198/143 - 91/143
= 107/143
\(\dfrac{9}{11}\times\dfrac{10}{13}+\dfrac{9}{13}\times\dfrac{12}{11}-\dfrac{7}{11}=\dfrac{9}{13}\times\dfrac{10}{11}+\dfrac{9}{13}\times\dfrac{12}{11}-\dfrac{7}{11}=\dfrac{9}{13}\times\left(\dfrac{10}{11}+\dfrac{12}{11}\right)-\dfrac{7}{11}=\dfrac{9}{13}\times2-\dfrac{7}{11}=\dfrac{18}{13}-\dfrac{7}{11}=\dfrac{107}{143}\)
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72
=1.5-0.8(3)+0.58(3)-0.3(6)-0.3(095238)+0.267(857142)-0236(1)
=0.(8)
tính nhanh nha bn thế là chưa tinh nhanh đâu
560394 : 294 = .......................
giúp mình với mình đang vội
`@` `\text {Ans}`
`\downarrow`
`a)`
`-9/34*17/4`
`=`\(\dfrac{-9}{17\cdot2}\cdot\dfrac{17}{4}\)
`=`\(-\dfrac{9}{2}\cdot\dfrac{1}{4}\)
`=`\(-\dfrac{9}{8}\)
`b)`
\(\dfrac{17}{15}\div\dfrac{4}{3}\)
`=`\(\dfrac{17}{15}\cdot\dfrac{3}{4}\)
`=`\(\dfrac{17}{3\cdot5}\cdot\dfrac{3}{4}\)
`=`\(\dfrac{17}{5}\cdot\dfrac{1}{4}\)
`=`\(\dfrac{17}{20}\)
`c)`
\(4\dfrac{1}{5}\div\left(-2\dfrac{4}{5}\right)\)
`=`\(4\dfrac{1}{5}\cdot\left(-\dfrac{5}{14}\right)\)
`=`\(\dfrac{21}{5}\cdot\left(-\dfrac{5}{14}\right)\)
`=`\(-\dfrac{21}{14}=-\dfrac{3}{2}\)
a) \(\dfrac{-9}{34}\cdot\dfrac{17}{4}\)
\(=\dfrac{-9\cdot17}{34\cdot4}\)
\(=-\dfrac{153}{136}\)
\(=\dfrac{9}{8}\)
b) \(\dfrac{17}{15}:\dfrac{4}{3}\)
\(=\dfrac{17}{15}\cdot\dfrac{3}{4}\)
\(=\dfrac{17\cdot3}{15\cdot4}\)
\(=\dfrac{51}{60}=\dfrac{17}{20}\)
c) \(4\dfrac{1}{5}:\left(-2\dfrac{4}{5}\right)\)
\(=\dfrac{21}{5}:-\dfrac{14}{5}\)
\(=\dfrac{21}{5}\cdot-\dfrac{5}{14}\)
\(=\dfrac{21\cdot-5}{5\cdot14}\)
\(=-\dfrac{105}{70}=\dfrac{3}{2}\)
\(x+17\) \(⋮\) \(x\) + 11 đkxđ \(x\) \(\ne\) - 11
\(x+11\) + 6 ⋮ \(x\) + 11
6 \(⋮\) \(x+11\)
\(x+11\) \(\in\) Ư(6) = { -6; -3; -2; -1; 1; 2; 3; 6}
\(x\) \(\in\) { -17; - 14; -13;-12; -10; - 9; -8; -5}
X + 17 = X + 11 + 6
Để (X + 17) ⋮ (X + 11) thì 6 ⋮ (X + 11)
⇒ X + 11 ∈ Ư(6) = {-6; -3; -2; -1; 1; 2; 3; 6}
⇒ X ∈ {-17; -14; -13; -12; -10; -9; -8; -5}
\(=\frac{\left(\frac{9}{5}+\frac{8}{5}\right)}{\frac{17}{15}}=\frac{\left(\frac{17}{5}\right)}{\left(\frac{17}{15}\right)}=\frac{255}{85}\)
#)Giải :
\(\frac{17}{15}+x=\frac{5}{11}+\frac{17}{11}\)
\(\frac{17}{15}+x=2\)
\(\Rightarrow x=\frac{13}{15}\)
\(\frac{17}{15}+x=\frac{5}{11}+\frac{17}{11}\)
\(\Rightarrow\frac{17}{15}+x=2\left(\frac{5}{11}+\frac{17}{11}=\frac{22}{11}=2\right)\)
\(\Rightarrow x=2-\frac{17}{15}\)
\(\Rightarrow x=\frac{30}{15}-\frac{17}{15}\)
\(\Rightarrow x=\frac{13}{15}\)