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\(x+15,7=7,2\times2,5\)
\(x+15,7=18\)
\(x=18-15,7\)
\(x=2,3\)
Vậy \(x=2,3\)
\(x\times9,1+x\times1,9=26,4\)
⇔\(x\times\left(9,1+1,9\right)=26,4\)
\(x\times10=26,4\)
\(x=26,4:10\)
\(x=2,64\)
Vậy \(x=2,64\)
\(x:12,5=48-45,66\)
\(x:12,5=2,34\)
\(x=2,34\times12,5\)
\(x=29,25\)
Vậy \(x=29,25\)
Sửa đề:
\(x\times9,9+x\times10=12,5\)
⇔\(x\times\left(9,9+10\right)=12,5\)
\(x\times19,9=12,5\)
\(x=12,5:19,9\)
\(x=\dfrac{125}{199}\)
Vậy \(x=\dfrac{125}{199}\)
\(#PeaGea\)
`83,5 xx y + 17,5 xx y - y = 2022`
`83,5xxy+17,5xxy-1xxy=2022`
`y xx(83,5+17,5-1)=2022`
`y xx 100=2022`
`y=2022:100=20,22`
`@Shả`
Ta có : A=20/11×13 + 20/13×15 +20/15×17+...+20/53×55
A = 10 ×( 2/11×13+2/13×15+...12/53×55)
A = 10 ×(1/11-1/13+1/13-1/15+1/15-1/17+...+1/53-1/55)
A = 10 × (1/11-1/55)
A =10 × 4/55
A = 8/11
a) \(\dfrac{4}{6}+\dfrac{7}{13}+\dfrac{17}{9}-\dfrac{8}{9}+\dfrac{14}{6}+\dfrac{19}{13}\)
\(=\dfrac{2}{3}+\dfrac{7}{13}+\dfrac{17}{9}-\dfrac{8}{9}+\dfrac{7}{3}+\dfrac{19}{13}\)
\(=\left(\dfrac{2}{3}+\dfrac{7}{3}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}-\dfrac{8}{9}\right)\)
\(=\dfrac{9}{3}+\dfrac{26}{13}+\dfrac{9}{9}\)
\(=3+2+1\)
\(=6\)
b) \(\dfrac{328}{435}\times\dfrac{468}{432}\times\dfrac{435}{164}\times\dfrac{432}{984}\times\dfrac{164}{468}\)
\(=\dfrac{328\times468\times435\times432\times164}{435\times432\times164\times984\times468}\)
\(=\dfrac{328}{984}\)
\(=\dfrac{1}{3}\)
158,65-63,75:17=158,65-3,75=154,9
65,2:10-67,2x0,1=6,52-6,72=-0,23
xx35=164-83,5
x x35=80,5
x=80,5:35
x=2,3
[7,5x10-650x0,1]xx=8,4
[75-65]x x=8,4
10x x=8,4
x=8,4:10
x=0,84