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a: =>x=3/7+3/5=15/35+21/35=36/35
b: =>x/35=4/5-5/7=28/35-25/35=3/35
=>x=3
c: =>x<3/4+8/4=11/4
=>\(x\in\left\{0;1;2;3\right\}\)
d: =>5/3<x<5/6+24/6=29/6
=>\(x\in\left\{2;3;4\right\}\)
e: =>x<10/12-9/12=1/12
=>x=0
f: =>2/3<x<12/6-5/6=7/6
=>x=1
Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
Đề Bài :\(\frac{9}{14}\)- \(\frac{x}{7}\): \(\frac{5}{3}\)= \(\frac{3}{14}\)
ta có : \(\frac{9}{14}\)- \(\frac{x}{7}\)= \(\frac{3}{14}\)x \(\frac{5}{3}\)= \(\frac{5}{14}\)
\(\frac{x}{7}\)= \(\frac{9}{14}\)- \(\frac{5}{14}\)= \(\frac{4}{14}\)
\(\frac{4}{14}\)= \(\frac{x}{7}\)=> \(\frac{4}{14}\)= \(\frac{2}{7}\)=> x = 2
Để mình viết đề lại cho nhé:
\(x\times14-x:\frac{1}{9}+\frac{1}{9}=\frac{3}{11}\)
\(x\times14-x\times9+\frac{1}{9}=\frac{3}{11}\)
\(x\times\left(14-9\right)=\frac{3}{11}-\frac{1}{9}\)
\(x\times5=\frac{27}{99}-\frac{11}{99}\)
\(x\times5=\frac{16}{99}\)
\(x=\frac{16}{99}:5\)
\(x=\frac{16}{495}\)
x * 14 - x : 1/9 + 1/9 = 3/11
x * 14 - x * 9 + 1/9 = 3/11
x * (14 - 9) + 1/9 = 3/11
x * 5 + 1/9 = 3/11
x * 5 = 3/11 - 1/9
x * 5 = 16/99
x = 16/99 : 5
x = 16/495
a, X = 273
b, X = 156
c, X = 4
d, X = 505
e, X = \(\frac{37}{245}\)