x+x*1/4:2/7+x:2/9=255
tính nhanh
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\(x+x\times\frac{1}{4}:\frac{2}{7}+x:\frac{2}{9}=255\)
\(\Rightarrow x+x\times\frac{1}{4}\times\frac{7}{2}+x\times\frac{9}{2}=255\)
\(\Rightarrow x+x\times\frac{7}{8}+x\times\frac{9}{2}=255\)
\(\Rightarrow x\times\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)
\(\Rightarrow x\times\left(\frac{8}{8}+\frac{7}{8}+\frac{36}{8}\right)=255\)
\(\Rightarrow x\times\frac{51}{8}=255\)
\(\Rightarrow x=255:\frac{51}{8}\)
\(\Rightarrow x=40\)
Vậy \(x=40\)
~ Ủng hộ nhé
`9/2xx7/3-4/3xx9/2`
`=9/2xx(7/3-4/3)`
`=9/2xx3/3`
`=9/2xx1`
`=9/2`
\(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x:\dfrac{2}{9}=255\)
\(x+x\times\dfrac{7}{8}+x\times\dfrac{9}{2}=255\)
\(x\times\left(1+\dfrac{7}{8}+\dfrac{9}{2}\right)=255\)
\(x\times\dfrac{51}{8}=255\)
\(x=255:\dfrac{51}{8}\)
\(x=255\times\dfrac{8}{51}\)
\(x=40\)
\(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x:\dfrac{2}{9}=255\)
\(x+x\times\dfrac{7}{8}+x\times\dfrac{9}{2}=255\)
\(x+\left(1+\dfrac{7}{8}+\dfrac{9}{2}\right)=255\)
\(x\times\dfrac{51}{8}=255\)
\(x=255:\dfrac{51}{8}\left(255\times\dfrac{8}{51}\right)\)
\(x=40\)
tk cho mk nhé
`!`
\(a,\dfrac{8}{9}\times\dfrac{7}{5}-\dfrac{7}{9}\times\dfrac{2}{5}+\dfrac{2}{9}\\ =\dfrac{8}{9}\times\left(\dfrac{7}{5}-\dfrac{2}{5}\right)+\dfrac{2}{9}\\ =\dfrac{8}{9}\times\dfrac{5}{5}+\dfrac{2}{9}\\ =\dfrac{8}{9}+\dfrac{2}{9}\\ =\dfrac{10}{9}\)
\(b,\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{3}{12}\\ =\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{1}{4}\\ =\dfrac{1}{4}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\\ =\dfrac{1}{4}\times\dfrac{9}{9}\\ =\dfrac{1}{4}\)
a: \(=\dfrac{4}{5}\cdot\dfrac{7}{3}\cdot\dfrac{3}{7}\cdot\dfrac{5}{4}+2011=2011+1=2012\)
b: \(=\dfrac{1}{3}\cdot\dfrac{9}{7}\cdot\dfrac{7}{9}=\dfrac{1}{3}\)
x + x * 1/4 : 2/7 + x : 2/9 = 255
x + x * 1/4 * 7/2 + x * 9/2 = 255
x + x * 7/8 + x * 9/2 = 255
x * ( 1 + 7/8 + 9/2 ) = 255
x * (8/8 + 7/8 + 36/8 ) = 255
x * 51/8 = 255
x = 255 : 51/8
x = 255* 8/51
x = 40
Chúc bạn học tốt!
x + x × 1/4 : 2/7 + x : 2/9 = 255
x + x × 1/4 × 7/2 + x × 9/2 = 255
x + x × 7/8 + x × 9/2 = 255
x × (1 + 7/8 + 9/2) = 255
x × (8/8 + 7/8 + 36/8) = 255
x × 51/8 = 255
x = 255 : 51/8
x = 255 × 8/51
x = 40
x + x × 1/4 : 2/7 + x : 2/9 = 255
x + x × 1/4 × 7/2 + x × 9/2 = 255
x + x × 7/8 + x × 9/2 = 255
x × (1 + 7/8 + 9/2) = 255
x × (8/8 + 7/8 + 36/8) = 255
x × 51/8 = 255
x = 255 : 51/8
x = 255 × 8/51
x = 40
x + x × 1/4 : 2/7 + x : 2/9 = 255
x + x × 1/4 × 7/2 + x × 9/2 = 255
x + x × 7/8 + x × 9/2 = 255
x × (1 + 7/8 + 9/2) = 255
x × (8/8 + 7/8 + 36/8) = 255
x × 51/8 = 255
x = 255 : 51/8
x = 255 × 8/51
x = 40
Vậy x = 40
Lời giải:
$x+x\times \frac{1}{4}: \frac{2}{7}+x: \frac{2}{9}=255$
$x+x\times \frac{7}{8}+x\times \frac{9}{2}=255$
$x\times (1+\frac{7}{8}+\frac{9}{2})=255$
$x\times \frac{51}{8}=255$
$x=255: \frac{51}{8}=40$