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a) x + 1/15 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12.
=> x = 1/12 - 1/15 = 5/60 - 4/60 = 1/60.
b) x - 5/12 = 1/3 + 1/4 = 4/12 + 3/12 = 7/12.
=> x = 7/12 + 5/12 = 1
c) x x 2/7 = 3/4 x 4/15 = 1/5
=> x = 1/5 : 2/7 = 1/5 x 7/2 = 7/10
d) x : 3/8 = 4/3 : 3/6 = 4/3 x 2 = 8/3
=> x = 8/3 x 3/8 = 1
a) \(x+\frac{1}{5}-\frac{2}{7}=4\frac{1}{2}\)
=> \(x+\frac{1}{5}-\frac{2}{7}=\frac{9}{2}\)
=> \(x=\frac{9}{2}+\frac{2}{7}-\frac{1}{5}=\frac{321}{70}\)
b) \(1\frac{3}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x=\frac{47}{8}\)
=> \(x=\frac{33}{8}\)
c) \(\frac{1}{2}-\frac{1}{3}\cdot x=\frac{3}{4}\)
=> \(\frac{1}{3}\cdot x=\frac{1}{2}-\frac{3}{4}=-\frac{1}{4}\)
=> \(x=\left(-\frac{1}{4}\right):\frac{1}{3}=\left(-\frac{1}{4}\right)\cdot3=-\frac{3}{4}\)
Bé Na tìm đây nha:
Câu hỏi của ngô thị gia linh - Toán lớp 6 - Học toán với OnlineMath
hay Giải toán trên mạng - Giúp tôi giải toán - Hỏi đáp, thảo luận về toán học - Học toán với OnlineMath
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b) 9/5 : (2 . x + 1) - 2 = 7
9/5 : ( 2 . x + 1) = 7 + 2
9/5 : ( 2 . x + 1) = 9
2 . x + 1 = 9/5 : 9
2 . x + 1 = 1/5
2 . x = 1/5 - 1
2 . x = - 4/5
x = - 4/5 : 2
x = - 2/5
a, (x-3).2=4
x-3 = 2
x = 5
b, 3/2 - 2/3 : x = 1/2
2/3 : x = 3/2 - 1/2
2/3 : x = 1
x = 3/2
c, 4/3 + 1/3 : (x - 1/2) = 4
1/3 : (x - 1/2) = 4 - 4/3
1/3 : (x - 1/2) = 8/3
x - 1/2 = 1/8
x = 9/8
a) 4/7 x X = 1/5 + 2/3
=> 4/7 x X = 3/15 + 10/15
=> 4/7 x X = 13/15
=> X = 13/15 : 4/7
=> X = 13/15 x 4/7 = 52/105
a ) 4 / 7 x X = 1 / 5 + 2 / 3
= > 4 / 7 x X = 3 / 1 5 + 1 0 / 1 5
= > 4 / 7 x X = 1 3 / 1 5
= > X = 1 3 / 1 5 : 4 / 7
= > X = 1 3 / 1 5 x 4 / 7
= 5 2 / 1 0 5
Bài 1:
a; (\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\)) x \(\dfrac{3}{4}\) = \(\dfrac{1}{4}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) : \(\dfrac{3}{4}\)
\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) x \(\dfrac{4}{3}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{3}\)
\(\dfrac{1}{4}x\) = \(\dfrac{1}{3}\) + \(\dfrac{1}{8}\)
\(\dfrac{1}{4}\) \(x\)= \(\dfrac{8}{24}\) + \(\dfrac{11}{24}\)
\(\dfrac{1}{4}x=\dfrac{11}{24}\)
\(x=\dfrac{11}{24}:\dfrac{1}{4}\)
\(x=\dfrac{11}{24}\times4\)
\(x=\dfrac{11}{6}\)
b; \(\dfrac{12}{5}:x\) = \(\dfrac{14}{3}\) x \(\dfrac{4}{7}\)
\(\dfrac{12}{5}\) : \(x\) = \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) : \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) x \(\dfrac{3}{8}\)
\(x\) = \(\dfrac{9}{10}\)
\(a,\frac{1}{3}+\frac{1}{6}+x=\frac{3}{4}\) \(b,\frac{1}{2}+\frac{1}{3}-x=\frac{2}{3}\) \(c,\frac{2}{3}\cdot\frac{3}{4}\cdot x=\frac{2}{5}\)
\(\left(\frac{1}{3}+\frac{1}{6}\right)+x=\frac{3}{4}\) \(\left(\frac{1}{2}+\frac{1}{3}\right)-x=\frac{2}{3}\) \(\left(\frac{2}{3}\cdot\frac{3}{4}\right)\cdot x=\frac{2}{5}\)
\(\frac{1}{2}+x=\frac{3}{4}\) \(\frac{5}{6}-x=\frac{2}{3}\) \(\frac{1}{2}\cdot x=\frac{2}{5}\)
\(x=\frac{3}{4}-\frac{1}{2}\) \(x=\frac{5}{6}-\frac{2}{3}\) \(x=\frac{2}{5}:\frac{1}{2}\)
\(x=\frac{1}{4}\) \(x=\frac{1}{6}\) \(x=\frac{4}{5}\)
\(d,x:\left(\frac{1}{4}:\frac{1}{2}\right)=\frac{2}{3}\) \(e,\frac{1}{3}:\frac{1}{2}:x=\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{2}{3}\) \(\frac{1}{3}:\frac{1}{2}=\frac{3}{4}\cdot x\)
\(x=\frac{2}{3}\cdot\frac{1}{2}\) \(\frac{2}{3}=\frac{3}{4}\cdot x\)
\(x=\frac{1}{3}\) \(x=\frac{2}{3}:\frac{3}{4}\)
\(x=\frac{8}{9}\)
a) 1/3 + 1/6 +x = 3/4 b) 1/2 + 1/3 - x = 2/3
5/6 - x = 2/3
x =5/6 -2/3
x = 1/6
1/2+ x =3/4
x = 3/4 -1/2
x = 1/4
\(x+\dfrac{1}{2}\times\dfrac{1}{3}=\dfrac{3}{4}\)
=>\(x+\dfrac{1}{6}=\dfrac{3}{4}\)
=>\(x=\dfrac{3}{4}-\dfrac{1}{6}=\dfrac{9}{12}-\dfrac{2}{12}=\dfrac{7}{12}\)