x + 1 / 4 = 75 %
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a: \(12:\dfrac{3}{4}+75\%\cdot\dfrac{1}{2}-16\cdot50\%\)
\(=12\cdot\dfrac{4}{3}+\dfrac{3}{4}\cdot\dfrac{1}{2}-16\cdot0,5\)
\(=16-8+\dfrac{3}{8}\)
\(=8,375\)
b: \(75\%\cdot4+22,5:3-1\dfrac{3}{5}\)
\(=0,75\cdot4+7,5-1,6\)
\(=3+7,5-1,6\)
=10,5-1,6
=8,9
a) \(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
0,5 x + 0,6 ( x - 2 ) = 3
0,5 x + 0.6 x - 1,2 = 3
1,1 x = 4,2
x = \(\frac{42}{11}\)
Kết luận:
b) \(\frac{1}{3}x-0,5x=0,75\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(-\frac{1}{6}x=\frac{3}{4}\)
\(x=-\frac{9}{2}\)
Kết luận:
c) \(\frac{3}{-2}x-0,5x=75\%\)
-1,5x - 0,5x = 0,75
-2x = 0,75
x = -0,375
Kết luận:
d) \(-\frac{2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
-0,4 x + 0,25 = 0,75 - 0,75 x
-0,4 x + 0,75 x = 0,75 - 0,25
0,35 x = 0,5
x = \(\frac{10}{7}\)
Kết luận:
\(a,\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
\(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)
\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)
\(\frac{11}{10}x-\frac{6}{5}=3\)
\(\frac{11}{10}x=\frac{21}{5}\)
\(x=\frac{42}{11}\)
\(b,\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{-1}{6}x=\frac{3}{4}\)
\(x=\frac{-9}{2}\)
\(c,\frac{3}{-2}x-\frac{1}{2}x=75\%\)
\(\left(\frac{3}{-2}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(-2x=\frac{3}{4}\)
\(x=\frac{-3}{8}\)
\(\frac{-2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
\(\frac{-2}{5}x+\frac{3}{4}x=\frac{3}{4}-\frac{1}{4}\)
\(\left(\frac{-2}{5}+\frac{3}{4}\right)x=\frac{1}{2}\)
\(\frac{7}{20}x=\frac{1}{2}\)
\(x=\frac{10}{7}\)
\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=\frac{-51}{4}\)
\(x.\left(\frac{1}{3}+\frac{3}{4}\right)-\frac{3}{4}=\frac{-51}{4}\)
\(x.\left(\frac{4}{12}+\frac{9}{12}\right)=\frac{-51}{4}+\frac{-3}{4}\)
\(x.\frac{13}{12}=\frac{-54}{4}=\frac{-27}{2}\)
\(x=\frac{-27}{2}:\frac{13}{12}=\frac{-27}{2}.\frac{2}{13}=\frac{-27.2}{2.13}=\frac{-27.1}{1.13}=\frac{-27}{13}\)
Xin lỗi cho mình sửa lại
\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=\frac{-51}{4}\)
\(x.\left(\frac{1}{3}+\frac{3}{4}\right)-\frac{3}{4}=\frac{-51}{4}\)
\(x.\left(\frac{4}{12}+\frac{9}{12}\right)=\frac{-51}{4}+\frac{3}{4}=\frac{-48}{4}\)
\(x.\frac{13}{12}=-12\)
\(x=-12:\frac{13}{12}=12.\frac{12}{13}=\frac{-12.12}{13}=\frac{-144}{13}\)
\(a,x.\frac{3}{4}-1=\frac{2}{75}\)
\(x.\frac{3}{4}=\frac{77}{75}\)
\(x=\frac{77}{75}:\frac{3}{4}=\frac{308}{225}\)
\(b,3-x:\frac{2}{3}=75\)
\(x:\frac{2}{3}=-72\)
\(x=-72.\frac{2}{3}=-48\)
\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=-\frac{21}{4}\)
\(\frac{1}{3}.x+\frac{3}{4}.x-\frac{3}{4}=-\frac{21}{4}\)
\(x.\left(\frac{1}{3}+\frac{3}{4}\right)=-\frac{21}{4}+\frac{3}{4}\)
\(x.\frac{13}{12}=-\frac{9}{2}\)
\(x=-\frac{9}{2}:\frac{13}{12}\)
\(x=-\frac{54}{13}\)
=> x.(1/3+3/4) -75/100=-21/4
=> x .13/12 - 3/4 =21/4
=> x. 13/12 =21/4 + 3/4
=> x.13/12 =6
=> x = 6 : 13/12
=> x = 72/13
vậy x= 72/13
\(75\%x-x=1-\frac{3}{4}\)
\(\Rightarrow\frac{75}{100}.x-x=\frac{1}{4}\)
\(\Rightarrow\frac{3}{4}x-x=\frac{1}{4}\)
\(\Rightarrow x.\left(\frac{3}{4}-1\right)=\frac{1}{4}\)
\(\Rightarrow x.\frac{-1}{4}=\frac{1}{4}\)
\(\Rightarrow x=-1\)
`x+1/4=75%`
`x+1/4=3/4`
`x=3/4-1/4`
`x=2/4=1/2`
\(x+\dfrac{1}{4}=75\%\)
\(x+\dfrac{1}{4}=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}-\dfrac{1}{4}\)
\(x=\dfrac{2}{4}=\dfrac{1}{2}\)