x + x * 3/2 +x * 7/2 =252
dễ lắm đó nha!^-^
tìm số nguyên x,y
a) (x-1).(y+1)=5
b) (x+2). (y -3)= -3
c) ( 3-x). (xy+5)= -1
d) (x-7).(y+2)= 0
e) |x-1|. |y+1|=2
các bạn giải giúp mình nha<3 mình gấp lắm đó. cảm ơn các bạn trước nha!
1. Tĩm x :
a) \(\frac{11}{2}-\frac{2}{3}:|2x+\frac{-3}{2}|=3\)
b) \(|\frac{2}{7}x-\frac{1}{5}|-|-x+\frac{4}{9}|=0\)
NHANH LÊN NHA MK CẦN GẤP GẤP LẮM LẮM LUÔN LUÔN ĐÓ
AI NHANH MK CHO 1 TICK
1.
a) \(\frac{11}{2}-\frac{2}{3}:\left|2x+-\frac{3}{2}\right|=3\)
\(-\frac{2}{3}:\left|2x+-\frac{3}{2}\right|=3-\frac{11}{2}\)
\(-\frac{2}{3}:\left|2x+-\frac{3}{2}\right|=-\frac{5}{2}\)
\(\left|2x+-\frac{3}{2}\right|=-\frac{2}{3}:\left(-\frac{5}{2}\right)\)
\(\left|2x+-\frac{3}{2}\right|=\frac{4}{15}\)
\(\Rightarrow\left|2x+-\frac{3}{2}\right|\in\text{{}\frac{4}{15};-\frac{4}{15}\)}
Nếu, \(2x+\left(-\frac{3}{2}\right)=\frac{4}{15}\)
\(2x=\frac{53}{30}\)
\(x=\frac{53}{60}\)
Nếu, \(2x+\left(-\frac{3}{2}\right)=-\frac{4}{15}\)
\(2x=\frac{37}{30}\)
\(x=\frac{37}{60}\)
Vậy \(x\in\text{{}\frac{53}{60};\frac{37}{60}\)}
b) \(\left|\frac{2}{7}x-\frac{1}{5}\right|-\left|-x+\frac{4}{9}\right|=0\)
\(\left|\frac{2}{7}x-\frac{1}{5}\right|=\left|-x+\frac{4}{9}\right|\)
\(\Rightarrow\left|\frac{2}{7}x-\frac{1}{5}\right|\in\text{{}-x+\frac{4}{9};-\left(x+\frac{4}{9}\right)\)}
Nếu, \(\frac{2}{7}x-\frac{1}{5}=-x+\frac{4}{9}\)
\(x=\frac{203}{405}\)
Nếu, \(\frac{2}{7}x-\frac{1}{5}=-\left(-x+\frac{4}{9}\right)\)
\(\frac{2}{7}x-\frac{1}{5}=x-\frac{4}{9}\)
\(\frac{2}{7}x-x=\frac{1}{5}-\frac{4}{9}\)
\(-\frac{5}{7}x=-\frac{11}{45}\)
\(x=\frac{77}{225}\)
Vậy \(x\in\text{{}\frac{203}{405};\frac{77}{225}\)}
1 . Tìm x :
a ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
b) 2. ( 4x - 2x ) - 7x = 15
c) ( x-7 ) . ( x + 2019 ) = 0
NHANH LÊN NHA MK CẦN GẤP GẤP LẮM LẮM LUÔN LUÔN ĐÓ
AI NHANH MK CHO 1 TICK
\(\left(x-7\right)\left(x+2019\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-7=0\\x+2019=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-2019\end{cases}}\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Leftrightarrow-16=7-x-25-7\)
\(\Leftrightarrow-x=-16+25\)
\(\Leftrightarrow-x=9\)
\(\Leftrightarrow x=-9\)
\(2\left(4x-2x\right)-7x=15\)
\(\Leftrightarrow4x-7x=15\)
\(\Leftrightarrow x=-5\)
a ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
9 - 25 = 7 - x - 25 - 7
9 - 25 - 7 + 25 + 7 = -x
9 = - x
=> x = -9
Vậy x = -9
b) 2 . ( 4x - 2x ) - 7x = 15
8x - 4x - 7x = 15
-3x = 15
x = 15 : ( - 3 )
x = -5
Vậy x = -5
c ) ( x - 7 ). ( x + 2019 ) = 0
=> x - 7 = 0 hoặc x + 2019 = 0
=> x = 7 hoặc x = - 2019
vậy x \(\in\){ 7 ; -2019 }
a. 9 - 25 = (7 - x) - (25 + 7)
=> -16 = 7 - x - 25 - 7
=> -16 = -x - 25
=> -x = 9
=> x = -9
b. 2 . (4x - 2x) - 7x = 15
=> 2 . 2x - 7x = 15
=> 4x - 7x = 15
=> -3x = 15
=> x = -5
c. (x - 7) . (x + 2019) = 0
=> x - 7 = 0 hoặc x + 2019 = 0
=> x = 7 hoặc x = -2019
tìm x
3.(5x-1)-x.(x-2)+x^2-13x=7
các bạn giải chi tiết nha mình ko hiểu cho lắm
\(3\left(5x-1\right)-x\left(x-2\right)+x^2-13x=7\)
\(\Leftrightarrow15x-3-x^2+2+x^2-13x=7\)
\(\Leftrightarrow2x-1=7\)
\(\Leftrightarrow2x=8\)
\(\Leftrightarrow x=\frac{8}{2}=4\)
\(3\left(5x-1\right)-x\left(x-2\right)+x^2-13x=7\)
\(\Leftrightarrow15x-3-x^2+2x+x^2-13x=7\)
\(\Leftrightarrow4x-3=7\)
\(\Leftrightarrow4x=10\)
\(\Leftrightarrow x=\frac{5}{2}\)
Tìm x biết:
a) |x|+3√x^2+4+x^2010=6
b) 2010|7-x^2|^2009+2009(x+√7)^2010≤0
(Mình cần gấp lắm, giúp mình nha)
tim x
a,/x+2/>7
b,/x-1/<3
giải giúp mình nha mình cần gấp lắm
/ x + 2 / > 7
Th1 : \(x+2\ge0=>x\ge-2\)
PT trở thành :
\(x+2>7\)
\(=>x>5\)
TH2 : \(x+2< 0=>x< -2\)
Pt trở thành :
\(-x-2>7\)
\(=>-x=9=>x>-9\)
b) Th1 : \(x-1\ge0=>x\ge1\)
Ta có : \(x-1< 3=>x< 4\)
Th2 : \(x-1< 0=>x< 1\)
Ta có : \(-x+1< 3=>-x< 2=>x< -2\)
tìm x biết:
a,2/5:(-x-1/2)=4/5
b,x+2/11+x+2/12=x+2/13+x+2/14+x+2/15
c,x+1/9+x+2/8=x+3/7+x+4/6
Giúp mk nha,mk cần gấp lắm
Tìm x . biết :
\(a,\frac{2}{5}:\left(-x-\frac{1}{2}\right)=\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}:\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}.\frac{5}{4}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{1}{2}\)
\(\Rightarrow-x=\frac{1}{2}+\frac{1}{2}\)
\(\Rightarrow-x=1\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
a. \(\frac{2}{5}.\left(-x-\frac{1}{2}\right)=\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}:\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}.\frac{5}{4}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{1}{2}\)
\(\Rightarrow-x=\frac{1}{2}+\frac{1}{2}\)
\(\Rightarrow-x=1\)
\(\Rightarrow x=-1\)
a) x 2006 = x
b) ( 3x - 72) x 59= 4 x 56
c) 10 + 2x= 45 :53
NHANH LÊN NHA MK CẦN GẤP GẤP LẮM LẮM LUÔN LUÔN ĐÓ
a,(y/3-5)^2000=(y/3-5)^2008
b,(x-5)^2=(1-3x)^2
c,1/3*3^x+5*3^x-1=162
d, 2^x+2^x+3=144
e,(x-1)^3=(X-1)^4
g,(x-1)^x+1=(x-1)^x+2
nhanh nha đang cần gấp lắm đó!! ^.^
th1: \(\left(\frac{y}{3}-5\right)^{2008}-\left(\frac{y}{3}-5\right)^{2000}=0\)
\(\left(\frac{y}{3}-5\right)^{2000}.\left[\left(\frac{y}{3}-5\right)^8-1\right]=0\)
\(=>\orbr{\begin{cases}\left(\frac{y}{3}-5\right)^{2000}=0\\\left(\frac{y}{3}-5\right)^{2008}-1=0\end{cases}}\)
\(=>\orbr{\begin{cases}\frac{y}{3}=5=>y=15\\\frac{y}{3}=6=>y=18,\frac{y}{3}=4=>y=12\end{cases}}\)
Vậy ...
P/S: cái đoạn\(\left(\frac{y}{3}-5\right)^{2008}-1=0\)vì số mũ chẵn nên y=18 hay bằng 12 nha!