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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
1.
=3/5x(3/7+4/7)+2/5x(13/9-4/9)
=3/5x1+2/5x1
=3/5+2/5
=1
2.Xx(3/4+4/5)=7/10
Xx31/20=7/10
X =7/10:31/20
X =14/31
\(\frac{3}{5}\cdot\frac{3}{7}+\frac{3}{5}\cdot\frac{4}{7}+\frac{2}{5}\cdot\frac{13}{9}-\frac{2}{5}\cdot\frac{4}{9}\)
\(=\frac{3}{5}\cdot\left(\frac{3}{7}+\frac{4}{7}\right)+\frac{2}{5}\cdot\left(\frac{13}{9}-\frac{4}{9}\right)\)
\(=\frac{3}{5}\cdot1+\frac{2}{5}\cdot1\)\(=\frac{3}{5}+\frac{2}{5}=1\)
_________________________________________
\(\frac{3}{4}\cdot x+\frac{4}{5}\cdot x=\frac{7}{10}\)
\(\left(\frac{3}{4}+\frac{4}{5}\right)\cdot x=\frac{7}{10}\)
\(\frac{31}{20}\cdot x=\frac{7}{10}\)
\(x=\frac{7}{10}:\frac{31}{20}\)
\(x=\frac{14}{31}\)
6 lần số bé là:
201-3=198
Số bé là:
198:6=33
Số lớn là:
201-33=168
Bài 1 :
SL = SB x 5 + 3
Coi số bé là 1 phần thì số lớn là 5 phần và 3 đơn vi
Số bé là : ( 201 - 3 ) : ( 5 + 1 ) = 33
Số lớn là : 201 - 33 = 168
Bài 2 :
x + x . 1/4 : 2/7 + x : 2/9 = 255
x . 1 + x . 1/4 . 7/2 + x . 9/2 = 255
x . ( 1 + 1/4 . 7/2 + 9/2 ) = 255
x . ( 1 + 7/8 + 9/2 ) = 255
x . 51/8 = 255
x = 255 : 51/8
x = 40
\(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x:\dfrac{2}{9}=255\)
\(x+x\times\dfrac{7}{8}+x\times\dfrac{9}{2}=255\)
\(x\times\left(1+\dfrac{7}{8}+\dfrac{9}{2}\right)=255\)
\(x\times\dfrac{51}{8}=255\)
\(x=255:\dfrac{51}{8}\)
\(x=255\times\dfrac{8}{51}\)
\(x=40\)
\(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x:\dfrac{2}{9}=255\)
\(x+x\times\dfrac{7}{8}+x\times\dfrac{9}{2}=255\)
\(x+\left(1+\dfrac{7}{8}+\dfrac{9}{2}\right)=255\)
\(x\times\dfrac{51}{8}=255\)
\(x=255:\dfrac{51}{8}\left(255\times\dfrac{8}{51}\right)\)
\(x=40\)
tk cho mk nhé
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
\(x +x\cdot\frac{1}{4}\text{ : }\frac{2}{7}+x\text{ : }\frac{2}{9}=255\)
\(x+x\cdot0,25\text{ : }0,285714286+x\text{ : }0,222222222=255\)
\(x+x\cdot\left(0,25\text{ : }0,285714286\right)+x\text{ }\text{ : }0,222222222=255\)
\(x+x\cdot0,874999999+x\text{ : }0,222222222=255\)
\(x\cdot3\cdot\left(0,874999999\text{ : }0,222222222\right)=255\)
\(x\cdot3\cdot3,9375=255\)
\(x\cdot3=255\text{ : }3,9375\)
\(x\cdot3=64,7619048\)
\(x=64,7619048\text{ : }3\)
\(x=21,5873016\)