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Rút x chung ra rồi tính nhé, như này:
x(2+3+5) = 20090
Sau đó tính bình thường
`a)4/5:3/x xx2/11=24/165`
`(4/5xx2/11)xx 3/x=8/55`
`8/55xx3/x=8/55`
`3/x=8/55:8/55`
`3/x=1`
`3:x=1`
`x=3:1`
`x=3`
____________________________________________
`b)4/3:x/5=5/13xx4/9`
`4/3:x/5=20/117`
`x/5=4/3:20/117`
`x/5=39/5`
`x=39`
A) 4/5:3/x X 2/11=24/165
\(\dfrac{4}{5}:\dfrac{3}{x}X\dfrac{2}{11}=\dfrac{24}{165}\)
\(\dfrac{3}{x}=\dfrac{24}{165}:\dfrac{4}{5}:\dfrac{2}{11}\)
\(\dfrac{3}{x}=1\)
\(\dfrac{3}{x}=\dfrac{3}{3}\)
=> x=3
B) \(\dfrac{4}{3}:\dfrac{x}{5}=\dfrac{5}{13}x\dfrac{4}{9}\)
\(\dfrac{4}{3}:\dfrac{x}{5}=\dfrac{20}{117}\)
\(\dfrac{x}{5}=\dfrac{4}{3}:\dfrac{20}{117}\)
\(\dfrac{x}{5}=\dfrac{39}{5}\)
=> x = 39
2/3:x=7/10 X x5/9=5/18
x=7/10:2/3 x=5/18:5/9
x=21/20 x=1/2
3/7 x x = 1/3
x = 1/3 : 3/7
x = 7/9
3/5 : x = 2/3
x = 2/3 x 3/5
x = 6/15 = 2/5
3/7 * x = 1/3
x = 1/3 : 3/ 7 = 7/9
3/5 : x = 2/3
x = 3/5 : 2/3 = 9/10
x*3/5+x*2/7=31/70
x*(3/5+2/7) =31/70
x*31/35 =31/70
x =31/70 :31/35
x = 1/2
\(x.\frac{3}{5}+x.\frac{2}{7}=\frac{31}{70}\)
\(x\left(\frac{3}{5}+\frac{2}{7}\right)=\frac{31}{70}\)
\(x\left(\frac{21}{35}+\frac{10}{35}\right)=\frac{31}{70}\)
\(\frac{31}{35}x=\frac{31}{70}\)
\(x=\frac{31}{70}:\frac{31}{35}\)
\(x=\frac{31}{70}.\frac{35}{31}\)
\(x=\frac{35}{70}\)
\(x=\frac{1}{2}\)
vay \(x=\frac{1}{2}\)
( X + X x 2 ) : 24 = 305
X x 3 = 305 x 24
X x 3 = 7320
X = 7320 : 3
X = 2440
Chuc ban may man!
Viết lại 1 tí cho thuận mắt:
( x + 2x ) : 24 = 305
3x : 24 = 305
3x = 305 x 24
3x =7320
x = 7320 : 3
x = 2440