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\(a,\frac{1}{3}+\frac{1}{6}+x=\frac{3}{4}\) \(b,\frac{1}{2}+\frac{1}{3}-x=\frac{2}{3}\) \(c,\frac{2}{3}\cdot\frac{3}{4}\cdot x=\frac{2}{5}\)
\(\left(\frac{1}{3}+\frac{1}{6}\right)+x=\frac{3}{4}\) \(\left(\frac{1}{2}+\frac{1}{3}\right)-x=\frac{2}{3}\) \(\left(\frac{2}{3}\cdot\frac{3}{4}\right)\cdot x=\frac{2}{5}\)
\(\frac{1}{2}+x=\frac{3}{4}\) \(\frac{5}{6}-x=\frac{2}{3}\) \(\frac{1}{2}\cdot x=\frac{2}{5}\)
\(x=\frac{3}{4}-\frac{1}{2}\) \(x=\frac{5}{6}-\frac{2}{3}\) \(x=\frac{2}{5}:\frac{1}{2}\)
\(x=\frac{1}{4}\) \(x=\frac{1}{6}\) \(x=\frac{4}{5}\)
\(d,x:\left(\frac{1}{4}:\frac{1}{2}\right)=\frac{2}{3}\) \(e,\frac{1}{3}:\frac{1}{2}:x=\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{2}{3}\) \(\frac{1}{3}:\frac{1}{2}=\frac{3}{4}\cdot x\)
\(x=\frac{2}{3}\cdot\frac{1}{2}\) \(\frac{2}{3}=\frac{3}{4}\cdot x\)
\(x=\frac{1}{3}\) \(x=\frac{2}{3}:\frac{3}{4}\)
\(x=\frac{8}{9}\)
a) 1/3 + 1/6 +x = 3/4 b) 1/2 + 1/3 - x = 2/3
5/6 - x = 2/3
x =5/6 -2/3
x = 1/6
1/2+ x =3/4
x = 3/4 -1/2
x = 1/4
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a\Câu 1:
200 : ( 15 - x ) = 15 + 5
200 : ( 15 - x ) = 20
15 - x = 200 : 20
15 - x = 10
x = 15 - 10
x = 5
Câu 2:
63 : ( x - 5 ) = 22 -1
63 : ( x - 5 ) = 21
x - 5 = 63 : 21
x - 5 = 3
x = 3 + 5
x = 8
a) \(15-3\left(x-1\right)-x=20\)
\(15-3x+3-x=20\)
\(-4x=2\)
\(x=-\frac{1}{2}\)
b) \(6x-2\left(x+3\right)=10\)
\(6x-2x-6=10\)
\(4x=16\)
\(x=4\)
c) \(25:\left(x+4\right)=5\)
\(x+4=25:5=5\)
\(x=1\)
d tự làm nha!
\(2\frac{3}{4}.\frac{1}{2}-\frac{1}{2}.\frac{3}{7}+\frac{1}{3}\)
\(=\frac{11}{4}.\frac{1}{2}-\frac{1}{2}.\frac{3}{7}+\frac{1}{3}\)
\(=\frac{11}{8}-\frac{3}{14}+\frac{1}{3}\)
\(=\frac{251}{168}\)
Bài 1 : a, thực hiện phép tính :
\(2\frac{3}{4}×\frac{1}{2}-\frac{1}{2}×\frac{3}{7}+\frac{1}{3}\)
\(=\frac{11}{4}×\frac{1}{2}-\frac{1}{2}×\frac{3}{7}+\frac{1}{3}\)
\(=\frac{1}{2}×\left(\frac{11}{4}-\frac{3}{7}\right)+\frac{1}{3}\)
\(=\frac{1}{2}×\frac{65}{28}+\frac{1}{3}\)
\(=\frac{65}{56}+\frac{1}{3}\)
\(=\frac{251}{168}\)
b , Tìm x biết :
a, 435- ( x + 16 ) = 425 : 17
435 - ( x + 16 ) = 25
x + 16 = 435 - 25
x + 16 = 410
x = 410 - 16
x = 394
Vậy x = 394
b, ( x + 3/4 ) × 7/4 = 5 - 7/6
( x + 3/4 ) × 7/4 = 23/6
x + 3/4 = 23/6 : 7/4
x + 3/4 = 23/6 × 4/7
x + 3/4 = 46/21
x = 46/21 - 3/4
x = 121/84
Vậy x = 121/84
b)0,5x+2/3x+2/3=7/2
1/2x+2/3x+2/3=7/2
x(1/2+2/3)+2/3=7/12
x.7/6+2/3 =7/12
x.7/6 =7/12-2/3
x.7/6 =-1/12
x =-1/12:7/6
x =-1/14
b)3/5-2/15:x=1/2
2/15:x =3/5-1/2
2/15:x =1/10
x =2/15:1/10
x = 4/3
`4 1/2 xx x - 2 1/2 xx x = 1 1/2`
`=> 9/2 xx x - 5/2 xx x = 3/2`
`=> (9/2-5/2)xx x=3/2`
`=>4/2xx x=3/2`
`=>x=3/2:4/2`
`=>x=3/2:2`
`=>x=3/2xx1/2`
`=>x=3/4`
Vậy `x=3/4`
__
`x xx1/2+x xx1/3=5/6`
`=>x xx(1/2+1/3)=5/6`
`=>x xx(3/6+2/6)=5/6`
`=>x xx5/6=5/6`
`=>x=5/6:5/6`
`=>x=5/6xx6/5`
`=>x=1`
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