x 1/2 cộng x x 1/4 cộng x x 1/8 bằng 21/24
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\(x\times\frac{1}{2}\)\(+x\times\frac{1}{4}\)\(+x\times\frac{1}{8}\)\(=\frac{21}{24}\)
\(x\times\frac{1}{2}\)\(+x\times\frac{1}{4}\)\(=\frac{21}{24}\)\(\div\frac{1}{8}\)
\(x\times\frac{1}{2}\)\(+x\times\frac{1}{4}\)\(=\frac{168}{24}\)
\(x\times\frac{1}{2}\)\(=\)\(\frac{168}{24}\div\frac{1}{4}\)
\(x\times\frac{1}{2}\)\(=\frac{1344}{24}\)
\(x=\frac{1344}{24}\div\frac{1}{2}\)
\(x=112\)
Bài 1:
a: \(\dfrac{25}{42}-\dfrac{20}{63}=\dfrac{75-40}{126}=\dfrac{35}{126}=\dfrac{5}{18}\)
b: \(\dfrac{9}{20}-\dfrac{13}{75}-\dfrac{1}{6}=\dfrac{135}{300}-\dfrac{52}{300}-\dfrac{50}{300}=\dfrac{33}{300}=\dfrac{11}{100}\)
Nếu : 2 x X + 1 = 8
Thì : 4 x X + 1 = ?
Ta có:
2 x X + 1 = 8
2 x X = 8 - 1
2 x X = 7
X = 7 : 2
X = 3,5
Vậy X = 3,5 ...
Nên: 4 x 3,5 + 1
= 14 + 1
= 15
... Vậy: 4 x X + 1 = 15
~ Hok T ~
1/\(\frac{\left(x+1\right)^2}{8}=\frac{8}{\left(x+1\right)^2}\)
=>\(\left(x+1\right)^4=8^2=64\)
=>\(x+1\in\left\{4;-4\right\}\)
=>\(x\in\left\{3;-5\right\}\)
2/ \(x+\frac{3}{4}=\frac{2}{5}\)
=>\(x=\frac{3}{4}-\frac{2}{5}=\frac{7}{20}\)
6 2/7 + 7 3/5 + 8 6/9 + 9 1/4 + 2/5 + 5/7 + 1/3 x 3/4 + 1967
= 44/7 + 38/5 + 78/9 + 37/4 + 2/5 + 5/7 + 1/3 + 1967
= ( 44/7 + 5/7 ) + ( 38/5 + 2/5 ) + ( 26/3 + 1/3 ) + ( 37/4 + 3/4 ) +1967
= 7 + 8 + 9 + 10 + 1967
= 15 + 9 + 10 + 1967
= 24 + 10 + 1967
= 34 + 1967
= 2001
[x+1]+[x+2]+[x+3]+[x+4]+[x+5]=45
=[x+x+x+x+x]+[1+2+3+4+5]=45
=5x+15=45
5x=30
x=30:5
x=6
Vậy x=6
(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=45
(x+x+x+x+x)+1+2+3+4+5=45
5x+15=45
5x=45-15
5x=30
x=30:5
x=6
vậy x=6