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a)x(1/2-2/3)=7/12
x.(-1/6)=7/12
x=7/12 / (-1/6)
x=-7/2
b)x=13/15 / 5,5
x=26/165
c)3x/7 + 1=-1/28.(-4)
3x/7 + 1=1/7
3x/7=1/7-1=-6/7
3x=-6/7.7=-6
x=-6:3=-2
a,\(\frac{25}{42}-\frac{20}{63}=\frac{5}{18}\)
b,\(\frac{9}{50}-\frac{13}{75}-\frac{1}{6}\)
=\(\frac{1}{150}-\frac{1}{6}\)
=\(-\frac{4}{25}\)
c,\(\frac{2}{15}+\frac{-2}{65}-\frac{4}{39}\)
=\(\frac{32}{195}-\frac{4}{39}\)
=\(\frac{4}{65}\)
a,=75/126-40/126=35/126=5/18
b,=27/150-26/150-25/150=-4/25
c,=26/195+-6/195-20/195=0
0,5x-2/3x=7/12
=>(1/2-2/3).x=7/12
=>-1/6x=7/12
=>x=7/12:1/6
=>x=7/2
b, x:4 1/3=-2,5
=>x:13/3=-2,5
=>x=-5/2x13/3
=>x=-13
c,5,5x=13/15
=>11/2x=13/15
=>x=13/15:11/2
=>x=26/165
d,(3x/7+1):-4=-1/28
=>3x/7+1=-1/28x(-4)
=>3x/7+1=-1/7
=>3x/7=-1/7-1
=>3x/7=-8/7
=>3x=-8/7x7
=>3x=8
=>x=8:3
=>x=8/3
\(0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\left(\frac{1}{2}-\frac{2}{3}\right)x=\frac{7}{12}\)
\(\frac{-1}{6}x=\frac{7}{12}\)
\(x=-21\)
b,c,d tương tự
x*(5/10-2/3)=7/12
x*-1/6=7/12
x=7/12:-1/6
x=-7/2
làm như vậy đó
Ta có :\(\frac{x}{2}=\frac{36}{x+1}\)
=> x.(x+1)=2.36
=> x.(x+1)=72
mà 72= 8.9
=> x.(x+1)= 8.(8+1)
=> x = 8
Vậy x = 8
a,5/10-2/3x=7/12 b, x:4 1/3=-2,5 c, 5,5x=13/15
2/3x=5/10-7/12 x:13/3=-25/10 55/10x=13/15
2/3x=30/60-35/60 x=-25/10.13/3 x=13/15:55/10
2/3x=-1/12 x=-65/6 x=13/15.10/55
x=-1/12:2/3 x=26/165
x=-1/12.3/2
x=-1/8
d,(3x/7+1):(-4)=-1/28
(3x/7+1) = -1/28.(-4)
(3x/7+1) =1/7
3x/7 =1/7-1
3x/7 =-6/7
=> 3x=-6
x=-6:3
x=-2
=>x=-2
11/2*x=13/15
x=13/15:11/2
x=26/165
kết bạn với mình nha
x= 13/15*5.5 =\(\frac{165}{26}\)