Tim x,y,z biet:2(x-1)-3(2x+2)-4(2x+3)=16
Tim x,y,z biet:2(x-1)-3(2x+2)-4(2x+3)=16
giai day du
2(x-1)-3(2x+2)-4(2x+3)=16
\(\Rightarrow\)2x-2-6x-6-8x-12=16
\(\Rightarrow\)(2x-6x-8x)-(2+6+12)=16
\(\Rightarrow\)-12x-20=16
\(\Rightarrow\)-12x=16+20
\(\Rightarrow\)-12x=36
\(\Rightarrow\)x = 36 :(-12)
\(\Rightarrow\)x= -3 . tick nha
Tim x+y+z = ? biet (x-1) /2= (y-2) /3 = (z-3) /4 va 2x+3y-z=95
Áp dụng tính chất dãy tỉ số bằng nhau , ta có:
x-1/2 = y-2/3 = z-3/4 = 2x-2+3y-6-z+3/4+9-4 = 2x+3y-z + (-5)/9 = 90/9 = 10
x-1/2 = 10 => x= 21
y-2/3 = 10 => y = 32
z-3/4 = 10 => x = 43
Vậy x + y + z= 21 + 32 + 43 = 96
tim x,y,z biet
x+1/2 = y-2/3 = z-3/4 va 2x + 3y - z = 50
tim x,y,z biet
x+1/2 = y-2/3 = z-3/4 va 2x + 3y - z = 50
a, Tim x biet:/x-2/+/3-2x/=2x+1
b, Tim x,y thuoc Z biet:xy+2x-y=5
c, tim x,y,z, biet :2x=3y;4y=5zva 4x-3y+5z=7
tim a=2x+3y+z biet (x-1)^2+(y-3)^4-z^6=0
a,tim x biet |x-2|+|3-2x|=2x+1
b,tim x,y thuoc Z biet xy+2x-y=5
c, tinh A=(1-1/15)(1-1/21)(1-1/28).....(1-1/210)
Tim xthuoc Z biet:
1,|2x-5|-|2x+9|=0
2,|x+1|-|x+2|-|3-x|=7
3,|2x+3|+|3x+2|-|4-x|=10
tim x thuoc Z biet
a) 17-(2x-11) = 12-3x
b) /2x-3/ = 7
c) (2x-1)^4 = 16
d) (17-2x )^3=-125
a) 17-(2x-11) = 12-3x
2x-11 = 17-12+3x
2x-11 = 5+3x
2x-3x = 5+11
-x = 16
x = -16
b, |2x-3|=7
=>2x-3=7 hoặc 2x-3=-7
=>2x=10 hoặc 2x=-4
=>x=5 hoặc x=-2
c, (2x-1)4 = 16
(2x-1)4 = 24
2x-1=2
2x=3
x=3/2
d, (17-2x)3 = -125
(17-2x)3 = (-5)3
17-2x=-5
2x=17-(-5)
2x=22
x=11
a, => 17-2x+11 = 12-3x
=> 28-2x=12-3x
=> 28=12-3x+2x = 12-x
=> x=12-28 = -16
b, => 2x-3=7 hoặc 2x-3=-7
=> x=5 hoặc x=-2
c, => 2x-1=2 hoặc 2x-1=-2
=> x=3/2 hoặc x=-1.2
d, => 17-2x=-5
=> 2x=17-(-5) = 22
=> x=22:2 = 11
Tk mk nha