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\(\dfrac{3}{4}:x+\dfrac{1}{2}:\dfrac{1}{4}=4\)
\(\Rightarrow\dfrac{3}{4}:x+2=4\)
\(\Rightarrow\dfrac{3}{4}:x=2\Rightarrow x=\dfrac{3}{8}\)
\(\dfrac{3}{4}:x+\dfrac{1}{2}:\dfrac{1}{4}=4\)
\(\Leftrightarrow\dfrac{3}{4}:x=2\)
hay \(x=\dfrac{3}{8}\)
a) x + 1/15 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12.
=> x = 1/12 - 1/15 = 5/60 - 4/60 = 1/60.
b) x - 5/12 = 1/3 + 1/4 = 4/12 + 3/12 = 7/12.
=> x = 7/12 + 5/12 = 1
c) x x 2/7 = 3/4 x 4/15 = 1/5
=> x = 1/5 : 2/7 = 1/5 x 7/2 = 7/10
d) x : 3/8 = 4/3 : 3/6 = 4/3 x 2 = 8/3
=> x = 8/3 x 3/8 = 1
Bài giải
\(\left(\frac{1}{4}\text{ x }x-\frac{1}{8}\right)\text{ x }\frac{3}{4}=\frac{1}{4}\)
\(\left(\frac{1}{4}\text{ x }x-\frac{1}{8}\right)=\frac{1}{4}\text{ : }\frac{3}{4}\)
\(\frac{1}{4}\text{ x }x-\frac{1}{8}=\frac{1}{3}\)
\(\frac{1}{4}\text{ x }x=\frac{1}{3}+\frac{1}{8}\)
\(\frac{1}{4}\text{ x }x=\frac{11}{24}\)
\(x=\frac{11}{24}\text{ : }\frac{1}{4}=\frac{11}{24}\text{ x }4\)
\(x=\frac{11}{6}\)
\(\left(\frac{1}{4}\times a-\frac{1}{8}\right)\times\frac{3}{4}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{4}\times a-\frac{1}{8}=\frac{1}{4}:\frac{3}{4}\)
\(\Rightarrow\frac{1}{4}\times a-\frac{1}{8}=\frac{1}{3}\)
\(\Rightarrow\frac{1}{4}\times a=\frac{1}{3}+\frac{1}{8}\)
\(\Rightarrow\frac{1}{4}\times a=\frac{11}{24}\)
\(\Rightarrow a=\frac{11}{24}:\frac{1}{4}\)
\(\Rightarrow a=\frac{11}{6}\)
a) 4/7 x X = 1/5 + 2/3
=> 4/7 x X = 3/15 + 10/15
=> 4/7 x X = 13/15
=> X = 13/15 : 4/7
=> X = 13/15 x 4/7 = 52/105
a ) 4 / 7 x X = 1 / 5 + 2 / 3
= > 4 / 7 x X = 3 / 1 5 + 1 0 / 1 5
= > 4 / 7 x X = 1 3 / 1 5
= > X = 1 3 / 1 5 : 4 / 7
= > X = 1 3 / 1 5 x 4 / 7
= 5 2 / 1 0 5
`3/4 : x =1 1/2`
`=> 3/4 : x= 3/2`
`=>x= 3/4 : 3/2`
`=>x= 3/4 xx 2/3`
`=> x= 6/12`
`=> x= 1/2`
Vậy `x=1/2`
Thay `5/8-x` thì
`5/8-1/2= 5/8- 4/8=1/8`
\(\dfrac{3}{4}:x=1\dfrac{1}{2}\)
\(\dfrac{3}{4}:x=\dfrac{3}{2}\)
\(x=\dfrac{3}{4}:\dfrac{3}{2}\)
\(x=\dfrac{1}{2}\)
Vậy: \(\dfrac{5}{8}-x=\dfrac{5}{8}-\dfrac{1}{2}=\dfrac{1}{8}\)
1) 7/8 . x = 9/2
x = 9/2 : 7/8
x = 36/7
x - 1/2 . 1/8 = 2/8
x - 1/16 = 2/8
x = 2/8 - 1/16
x = 3/16
7/8 : x = 1/4
x = 7/8 : 1/4
x = 7/2
( 7/8 - x ) + 1/4 = 3/4
7/8 + x = 3/4 - 1/4
7/8 - x = 1/2
x = 7/8 - 1/2
x = 3/4
2) Nếu bớt chiều dài đi 12cm thì được hình vuông
=> Chiều dài hơn chiều rộng 12cm
Hiệu số phần bằng nhau là:
4 - 3 = 1
Chiều dài là:
12 : 1 x 4 = 48 ( cm )
Chiều rộng là:
48 - 12 = 36 ( cm )
Chu vi là:
( 48 + 36 ) x 2 = 168 ( cm )
Diện tích là:
48 x 36 = 1728 ( cm2 )
7/8 x X=9/2
X=9/2:7/8
X=36/7
x-1/2x1/8=2/8
x-1/16=2/8
x=2/8+1/16
x=5/16
7/8:x=1/4
x=7/8:1/4
x=7/2
(7/8-x)+1/4=3/4
(7/8-x)=3/4-1/4
(7/8-x)=1/2
x=7/8-1/2
x=3/8
(1/4 x X - 1/8) x 3/4 = 1/4
(1/4 x X - 1/8) = 1/4 : 3/4
(1/4 x X - 1/8) = 1/3
1/4 x X = 1/3+1/8
1/4 x X = 11/24
X = 11/24 : 1/4
X = 11/6
(1/4xX-1/8)x3/4=1/4
1/4xX-1/8=1/4:3/4
1/4xX-1/8=1/3
1/4xX=1/3+1/8
1/4xX=11/24
X=11/24:1/4
X=11/6
( \(\frac{1}{4}\) x X - \(\frac{1}{8}\) ) x \(\frac{3}{4}\) = \(\frac{1}{4}\)
\(\frac{1}{4}\) x X - \(\frac{1}{8}\) = \(\frac{1}{4}\) : \(\frac{3}{4}\)
\(\frac{1}{4}\) x X - \(\frac{1}{8}\) = \(\frac{1}{3}\)
\(\frac{1}{4}\) x X = \(\frac{1}{3}\)+ \(\frac{1}{8}\)
\(\frac{1}{4}\) x X = \(\frac{11}{24}\)
X = \(\frac{11}{24}\) : \(\frac{1}{4}\)
X = \(\frac{11}{6}\)
~ Hok T ~
(1/4*x -1/8) * 3/4=1/4
<=> 1/4* x - 1/8 = 1/3
<=>1/4* x = 1/3 + 1/8
<=> 1/4* x = 11/24
<=> x = 11/6