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a,
x+x×14÷27+x÷29=255�+�×14÷27+�÷29=255
⇒x+x×14×72+x×92=255⇒�+�×14×72+�×92=255
⇒x+x×78+x×92=255⇒�+�×78+�×92=255
⇒x.(1+78+92)=255⇒�.(1+78+92)=255
⇒x⋅518=255⇒�⋅518=255
⇒x=255÷518⇒�=255÷518
⇒x=255×851⇒�=255×851
⇒x=40⇒�=40
Vậy 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
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.4,5/3+x.7/2=255
x.(1+4,5/3+7/2)=255
x.6=255
x=255:6
x=42,5
Vậy x=42,5
\(x+x\times\frac{1}{4}:\frac{2}{7}+x:\frac{2}{9}=255\)
\(x+x\times\frac{1}{4}\times\frac{7}{2}+x\times\frac{9}{2}=255\)
\(x\times\left(1+\frac{1}{4}\times\frac{7}{2}+\frac{9}{2}\right)=255\)
\(x\times\frac{51}{38}=255\)
\(x=255:\frac{51}{38}\)
\(x=190\)
\(x+x.\frac{1}{4}:\frac{2}{7}+x:\frac{2}{9}=255\)
\(\Rightarrow x+x.\frac{1}{4}.\frac{7}{2}+x.\frac{9}{2}=255\)
\(\Rightarrow x+x.\frac{7}{8}+x.\frac{9}{2}=255\)
\(\Rightarrow x.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)
\(\Rightarrow x.\frac{51}{8}=255\)
\(\Rightarrow x=255:\frac{51}{8}\)
\(\Rightarrow x=40\)
Vậy x = 40
_Chúc bạn học tốt_
\(x +x\cdot\frac{1}{4}\text{ : }\frac{2}{7}+x\text{ : }\frac{2}{9}=255\)
\(x+x\cdot0,25\text{ : }0,285714286+x\text{ : }0,222222222=255\)
\(x+x\cdot\left(0,25\text{ : }0,285714286\right)+x\text{ }\text{ : }0,222222222=255\)
\(x+x\cdot0,874999999+x\text{ : }0,222222222=255\)
\(x\cdot3\cdot\left(0,874999999\text{ : }0,222222222\right)=255\)
\(x\cdot3\cdot3,9375=255\)
\(x\cdot3=255\text{ : }3,9375\)
\(x\cdot3=64,7619048\)
\(x=64,7619048\text{ : }3\)
\(x=21,5873016\)
\(x+x\times\frac{1}{4}\div\frac{2}{7}+x\div\frac{2}{9}=255\)
\(\Rightarrow x+x\times\frac{1}{4}\times\frac{7}{2}+x\times\frac{9}{2}=255\)
\(\Rightarrow x+x\times\frac{7}{8}+x\times\frac{9}{2}=255\)
\(\Rightarrow x.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)
\(\Rightarrow x\cdot\frac{51}{8}=255\)
\(\Rightarrow x=255\div\frac{51}{8}\)
\(\Rightarrow x=255\times\frac{8}{51}\)
\(\Rightarrow x=40\)
Vậy x = 40
X+X:3x4,5+Xx2:7=255
X+Xx4,5:3+Xx7:2=255
X+X x1 x 4,5:3+X x 7:2=255
X x(1+4,5:3+7:2)=255
X x 6=255
X=255:6
X=42,5.
vậy x =42,5 ( x viết hoa là Tìm x, còn x viết thường là dấu nhân nhé bạn)
Tick cho mik nhé