Tim x biet
x+x-1+x-2+...+x-50=255
tim x biet 50%.x+2/3.x=x+4
\(50\%x+\frac{2}{3}x=x+4\)
\(\Rightarrow x\left\{\frac{1}{2}+\frac{2}{3}=x=4\right\}\)
\(\Rightarrow\frac{7}{6}x=x+4\)
\(\Rightarrow7x=\left\{x+4\right\}6\)
\(\Rightarrow7x=6x+24\)
\(\Rightarrow7x-6x=24\)
\(\Rightarrow x=24\)
\(50\%\cdot x+\frac{2}{3}\cdot x=x+4\)
\(\frac{1}{2}x+\frac{2}{3}x=x+4\)
\(\left(\frac{1}{2}+\frac{2}{3}\right)x=x+4\)
\(\frac{7}{6}x=x+4\)
\(\left(\frac{7}{6}-1\right)x=4\)
\(\frac{1}{6}x=4\)
\(\Rightarrow x=24\)
\(50\%x+\frac{2}{3}x=x+4\)
\(\Rightarrow x\left(\frac{1}{2}+\frac{2}{3}\right)=x+4\)
\(\Rightarrow\frac{7}{6}x=x+4\)
\(\Rightarrow7x=\left(x+4\right)6\)
\(\Rightarrow7x=6x+24\)
\(\Rightarrow7x-6x=24\)
\(\Rightarrow x=24.\)
tim x biet 50%x+2/3x=x+4
=>1/2x+2/3x=x+4
x(1/2+2/3)=x+4
x7/6=x+4
x7/6-x-4=0
x(7/6-1)-4=0
=>x1/6=4
=>x=24
bai 1: Tim x biet
\(\hept{\begin{cases}x-y=\frac{3}{10}\\y\left(x-y\right)=-\frac{3}{50}\end{cases}}\)
bai 2: Tim x, y biet:
x+\(\left(-\frac{31}{12}\right)^2\)=\(\left(\frac{49}{12}\right)^2\)-x=y2
Bai 9: Tim x,y,z biet:
(x-1)2+(x+y)2+(xy-z)2=0
a) thay \(x-y=\frac{3}{10}\)vào \(y\left(x-y\right)=\frac{-3}{50}\)ta có\(\frac{3}{10}y=\frac{-3}{50}\)=>\(y=\frac{-3}{50}:\frac{3}{10}=\frac{-1}{5}\)=>\(x-y=\frac{3}{10}\Rightarrow x=\frac{3}{10}+\frac{-1}{5}=\frac{1}{10}\)
hôm sau mik giải tip cho
Tim x , biet:
a) 34 - ( x +50) = 18
b) 2x - 1 = 8
a) 34 - ( x +50) = 18
<=> x+50 = 34-18
<=> x + 50 = 16
<=> x = 16- 50
<=> x = - 34
b) 2x - 1 = 8
<=> 2x-1 = 23
<=> x - 1 = 3
<=> x = 3+1
<=> x = 4
haizzz ghi đề sai may nỏ
b) 2x-1 = 8
2x-1 = 23
=> x - 1 = 3
=> x = 3 + 1
=> x = 4
tim x biet:
( x^2-4x+16 )( x+4 )-x ( x+1 )(x+2)+3x^2=0
(8x+2)(1-3x)+(6x-1)(4x-10)=-50
( x2 - 4x + 16 )( x + 4 ) - x( x + 1 )( x + 2 ) + 3x2 = 0
<=> x3 + 43 - x( x2 + 3x + 2 ) + 3x2 = 0
<=> x3 + 64 - x3 - 3x2 - 2x + 3x2 = 0
<=> 64 - 2x = 0
<=> 2x = 64
<=> x = 32
( 8x + 2 )( 1 - 3x ) + ( 6x - 1 )( 4x - 10 ) = -50
<=> 2x - 24x2 + 2 + 24x2 - 64x + 10 = -50
<=> -62x + 12 = -50
<=> -62x = -62
<=> x = 1
tim x thuoc z biet:
8.(x-7)-6.(x-2)=8.6-50
8.(x-7)-6.(x-2)=8.6-50
8x-56-6x+12=-2
2x-44=-2
2x=42
x=21
Vậy x=21
bai 1 tim x biet
a)x-43+7=49-(50+3)
b)-(x-16)+70=45
bai2 tim x biet
a)2x-(-60)=3x-18
b)-45-5x=10-4x
a,
x-43+7=49-(50+3)
<=>x-36=49-53
<=>x-36=-4
<=>x=-4+36
<=>x=32
b
-(x-16)+70=45
<=>-x+16+70=45
<=>-x+86=45
<=>x=86-45
<=>x=41
Bài 2
a.,
2x-(-60)=3x-18
<=>2x+60=3x-18
<=>3x-2x=60+18
<=>x=78
b,
-45-5x=10-4x
<=>-4x+5x=-45-10
<=>x=-55
Nếu thấy bài làm của mình đúng thì tick nha bạn,mình xin chân thành cảm ơn.
a) x- 43 + 7 = 49 - (50 + 3)
x - 36 = -4
x = -4 + 36
x = 32
b) -(x - 16) + 70 = 45
-(x - 16) = -15
x - 16 = 15
x = 31
Bài 2:
2x - (-60) = 3x - 18
2x + 60 = 3x - 18
3x - 2x = 60 + 18
x = 78
b) -4- 5x = 10 - 4x
5x - 4x = -4 - 10
x = -14
Tim x, biet 74 : x = 37/50
=> 74/x = 37/50 =>74/x=74/100 => x=100
nhanh ko!!!!
1Rút gọn biểu thức a) (3x+1)^2+(3x-1)^2-2(3x+1)(3x-1)
b) 8(3^2+1)(3^4+1)...(2^16+1)
c ) (2^2+1)(2^4+1)...(2^32+1)
2 Tìm x biết
a) x(2x-1)-2x+1=0
b) 3x(x-1)=x-1
c) 3(x+2)-x^2-2x=0
d) x^3+x=0
3 Phân tích thành nhân tử
a) 4x^3-x
b) 6x^2-12xy+6y^2-24z^2
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