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a) x- 25%x= 1/2<=>x-1/4x=1/2<=>3/4x=1/2<=>x=1/2:3/4=2/3
b)\(\left(50\%x+2\frac{1}{4}\right).\frac{-2}{3}=\frac{17}{6}\Leftrightarrow-\frac{1}{3}x-\frac{3}{2}=\frac{17}{6}\Leftrightarrow x=-13\)
c)\(\left(3\frac{x}{7}+1\right):\left(-4\right)=\frac{-1}{28}\Leftrightarrow\frac{28+x}{7}:\left(-4\right)=\frac{-1}{28}\Leftrightarrow\frac{28+x}{-28}=\frac{1}{-28}\Leftrightarrow28+x=1\Leftrightarrow x=-27\)
d)\(\left(1\frac{1}{3}-25\%-\frac{5}{12}\right)-2x=1,6:\frac{3}{5}\Leftrightarrow\frac{2}{3}-2x=\frac{8}{3}\Leftrightarrow x=-1\)
a)x-25%x=1/2
x-1/4x=1/2
x.(1-1/4)=1/2
x.3/4=1/2
x=1/2:3/4
x=2/3
\(2^x=2\Rightarrow x=1\)
\(2^{2x+2}=8^2\Rightarrow2^{2x+2}=2^6\Rightarrow2x+2=6\)\(2x=6-2=3\Rightarrow x=3:2=\frac{3}{2}\)
=> \(\frac{4}{3}-\frac{1}{4}-\frac{5}{12}-2x=1,6:0,6\)
=> \(\frac{2}{3}-2x=\frac{8}{3}\)
=> \(2x=\frac{8}{3}-\frac{2}{3}\)
=> \(2x=2\)
=> \(x=2:2\)
=> \(x=1\)
2/5.x:7/3.1/8=25/15
2/5.x:7/24=5/3
2/5.x=5/3.7/24
2/5.x=6/34
x=6/34:2/5
x=15/34
\(\frac{2}{5}x:\frac{7}{3}.\frac{1}{8}=\frac{25}{15}\Leftrightarrow\frac{2}{5}x:\frac{7}{3}.\frac{1}{8}=\frac{5}{3}\Leftrightarrow\frac{2}{5}x:\frac{7}{3}=\frac{5}{3}:\frac{1}{8}\Leftrightarrow\frac{2}{5}x:\frac{7}{3}=\frac{5}{3}.8\Leftrightarrow\frac{2}{5}x:\frac{7}{3}=\frac{40}{3}\)
\(\Leftrightarrow\frac{2}{5}x=\frac{40}{3}.\frac{7}{3}\Leftrightarrow\frac{2}{5}x=\frac{280}{3}\Leftrightarrow x=\frac{280}{3}:\frac{2}{5}\Leftrightarrow x=\frac{280}{3}.\frac{5}{2}\Leftrightarrow x=\frac{700}{3}\)
Vậy .........
a) 6/2X +1 = 2/7
=6 x 7 = 2(2x+1)
42=4X + 2
42 - 2 = 4X
40 = 4X
10 =X
\(\frac{2x}{3}=\frac{7x-3}{15}\)
\(\Rightarrow30x=3\left(7x-3\right)\)
\(30x=21x-9\)
\(9x=-9\)
\(x=-1\)
\(\frac{11x-2}{7x+5}=\frac{11}{8}\)
\(\Rightarrow8\left(11x-2\right)=11\left(7x+5\right)\)
\(88x-16=77x+55\)
\(11x=71\)
\(x=\frac{71}{11}\)
\(\frac{2x+3}{3x+1}=\frac{3}{4}\)
\(\Rightarrow4\left(2x+3\right)=3\left(3x+1\right)\)
\(8x+12=9x+3\)
\(-x=-9\)
\(x=9\)
mk lộn đề câu a
bn giải lại giùm mk nha
\(\frac{2x+3}{6}=\frac{7x-3}{15}\)
a)5^3-5(x+4)=5^2
125-5(x+4)=25
5(x+4)=125-25
x+4=100:5
x=20-4
x=16
(1/3 - 2x)2/5 = -8/25
1/3 - 2x = -8/25 : 2/5
1/3 - 2x = -4/5
2x = 1/3 - (-4/5)
2x = 17/15
x = 17/15 : 2
x = 17/30
\(\left(\dfrac{1}{3}-2x\right)\cdot\dfrac{2}{5}=-\dfrac{8}{25}\)
=>\(-2x+\dfrac{1}{3}=-\dfrac{8}{25}:\dfrac{2}{5}=-\dfrac{8}{25}\cdot\dfrac{5}{2}=\dfrac{-4}{5}\)
=>\(-2x=-\dfrac{4}{5}-\dfrac{1}{3}=\dfrac{-17}{15}\)
=>\(x=\dfrac{17}{30}\)