(1,25 - 20% . x ) - 1/4 = 3/20 . x + 1/2
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a: \(=\dfrac{5}{4}\cdot\dfrac{2}{5}\cdot\dfrac{17}{21}\cdot\dfrac{7}{34}=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot\dfrac{1}{3}=\dfrac{1}{12}\)
b: =>0,5^x(0,5+1)=1,5
=>0,5^x=1
=>x=0
c: =>x*0,05-0,25*x=-1,2
=>-0,3*x=-1,2
=>x=4
d: =>x-1=1 hoặc x-1=-1
=>x=0 hoặc x=2
e: =5+4=9
`Nxx20%+1/4xxN+Nxx1,25+89=123`
`Nxx0,2+0,25xxN+Nxx1,25=123-89`
`Nxx(0,2+0,25+1,25)=34`
`Nxx1,7=34`
`N=34:1,7=20`
8,75 x X + 0,75 + 1,25 x X + 0,25 = 20 + 0,25 + 0,75
8,75 x X + 0,75 + 1,25 x X + 0,25 = 20 + 1
8,75 x X + 0,75 + 1,25 x X + 0,25 = 21
( 8,75 + 1,25 ) x X + ( 0,75 + 0,25) = 21
10 x X + 1 = 21
10 x X = 21 - 1
10 x X = 20
X = 20 : 10
X = 2
tk nha
8,75x X+0,75+1,25x X +0,25=20+1/4+0,75
8,75x X +0,75+1,25x X +0,25=21
(8,75+0,25)xX+0,75=21
9xX+0,75=21
9xX=21-0,75
9xX=20,25
X=20,25:9
X=2,25
mk nhanh nhất tk nha
a; - \(\dfrac{10}{13}\) + \(\dfrac{5}{17}\) - \(\dfrac{3}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{11}{20}\)
= - (\(\dfrac{10}{13}\) + \(\dfrac{3}{13}\)) + (\(\dfrac{5}{17}\) + \(\dfrac{12}{17}\)) - \(\dfrac{11}{20}\)
= - 1 + 1 - \(\dfrac{11}{20}\)
= 0 - \(\dfrac{11}{20}\)
= - \(\dfrac{11}{20}\)
b; \(\dfrac{3}{4}\) + \(\dfrac{-5}{6}\) - \(\dfrac{11}{-12}\)
= \(\dfrac{9}{12}\) - \(\dfrac{10}{12}\) + \(\dfrac{11}{12}\)
= \(\dfrac{10}{12}\)
= \(\dfrac{5}{6}\)
c; [13.\(\dfrac{4}{9}\) + 2.\(\dfrac{1}{9}\)] - 3.\(\dfrac{4}{9}\)
= [\(\dfrac{52}{9}\) + \(\dfrac{2}{9}\)] - \(\dfrac{4}{3}\)
= \(\dfrac{54}{9}\) - \(\dfrac{4}{3}\)
= \(\dfrac{14}{3}\)
Nx20%+1/4xN+1,25+89=123
Nx1/5+1/4xN+90,25=123
Nx(1/5+1/4)=123-90,25
Nx9/20=32,75
N=32,75x9/20
N=655/9
a , 5*x*8.3=20.75
5*x=20.75:8.3
5*x=2.5
x=2.5:5
x=0.5
b : làm tương tự nha bn
a, 5 nhân x bằng 20,75 : 8,3
5 nhân x bằng2,5
x bằng 2,5:5
x bằng 0,5
\(\frac{4}{5}x\frac{1}{20\%}+0,08=4,08\)
\(2001:25-1999:25=0,08\)
\(75x1,25=93,75\)
\(56x2,5x400=56000\)
\(1600:1,25=1280\)
\(k\)\(nha♥♥♥♥\)
\(=\left(\dfrac{1}{2}-\dfrac{6}{5}\right):\dfrac{21}{20}-\dfrac{25}{4}+\dfrac{1}{2}\)
\(=\dfrac{-7}{10}\cdot\dfrac{20}{21}-\dfrac{25}{4}+\dfrac{2}{4}\)
\(=\dfrac{-2}{3}-\dfrac{23}{4}=\dfrac{-8-69}{12}=\dfrac{-77}{12}\)
\(\left(\sqrt{\dfrac{1}{4}}-1,2\right):1\dfrac{1}{20}-\left(-\dfrac{5}{2}\right)^2+\left|1,25-\dfrac{3}{4}\right|\)
\(=-\dfrac{7}{10}:\dfrac{21}{20}-\dfrac{25}{4}+\left|\dfrac{1}{2}\right|\)
\(=-\dfrac{7}{10}.\dfrac{20}{21}-\dfrac{25}{4}+\dfrac{1}{2}\)
\(=-\dfrac{2}{3}-\dfrac{25}{4}+\dfrac{1}{2}\)
\(=-\dfrac{77}{12}\)