=>7(x-3)-4(2x+5)-14(x-1)=28
=>7x-21-8x-20-14x+14=28
=>-15x-27=28
=>-15x=55
hay x=-11/3
=>7(x-3)-4(2x+5)-14(x-1)=28
=>7x-21-8x-20-14x+14=28
=>-15x-27=28
=>-15x=55
hay x=-11/3
k) 8 - \(\dfrac{x-2}{2}\) = \(\dfrac{x}{4}\)
m) \(\dfrac{3x+2}{2}\) - \(\dfrac{3x+1}{6}\) = 2x + \(\dfrac{5}{3}\)
n) \(\dfrac{x+1}{7}\)+ \(\dfrac{x+2}{6}\) = \(\dfrac{x+3}{5}\) + \(\dfrac{x+4}{4}\)
o) \(\dfrac{x+5}{6}\) + \(\dfrac{x+6}{5}\) = x + 9
Giải các phương trình sau :
a) \(\dfrac{9x-0,7}{4}-\dfrac{5x-1,5}{7}=\dfrac{7x-1,1}{3}-\dfrac{5\left(0,4-2x\right)}{6}\)
b) \(\dfrac{3x-1}{x-1}-\dfrac{2x+5}{x+3}=1-\dfrac{4}{\left(x-1\right)\left(x+3\right)}\)
c) \(\dfrac{3}{4\left(x-5\right)}+\dfrac{15}{50-2x^2}=-\dfrac{7}{6\left(x+5\right)}\)
d) \(\dfrac{8x^2}{3\left(1-4x^2\right)}=\dfrac{2x}{6x-3}-\dfrac{1+8x}{4+8x}\)
BÀI 1: Giải phương trình sau:
a. (x - 4)3 = (x + 4)(x2 - x - 16)
b. \(\dfrac{x+2}{x}=\dfrac{x^2+5x+4}{x^2+2x}+\dfrac{x}{x+2}\)
c. \(\dfrac{x+1}{x-2}-\dfrac{5}{x+2}=\dfrac{12}{x^2-4}+1\)
d. (x + 3)2 - 25 = 0
e. \(\dfrac{3}{2x+10}+\dfrac{2x}{25-x^2}+\dfrac{3}{x-5}=0\)
f. \(\dfrac{x+5}{x-1}-\dfrac{x-1}{x-3}=\dfrac{8}{x^2-4x-3}\)
BÀI 2: Tìm m để phương trình sau số nghiệm x = 1:
3.(2x + m)(x + 2) - 2.(2x+1) = 18
BÀI 3: Giải phương trình:
a. (x-2)2 - 4.(x + 3) = x.(x-4)
b. \(\dfrac{3}{x+1}+\dfrac{x-1}{x-2}=\dfrac{x}{x-2}\)
c. \(\dfrac{x}{2x-6}+\dfrac{x}{2x+2}=\dfrac{2x^2}{x^2-2x-3}\)
d. (x + 3)2 - (x - 3)2 = 6x + 18
e. \(\dfrac{x+3}{x-2}=\dfrac{5}{\left(x-2\right)\left(3-x\right)}\)
f. \(\dfrac{12x^2+30x-21}{16x^2-9}-\dfrac{3x-7}{3-4x}=\dfrac{6x+5}{4x+3}\)
g. \(\dfrac{4}{x+1}-\dfrac{2}{x-2}=\dfrac{x+3}{x^2-x-2}\)
GIÚP MÌNH VỚI NHA !!!!
Bài 1: Giải các phương trình sau:
a. 7-( 2x + 4 ) = - (x+4)
b.\(\dfrac{2x}{x+1}=\dfrac{x^2-x+8}{\left(x+1\right)\left(x-4\right)}\)
c.\(\dfrac{2\left(3x+5\right)}{3}-\dfrac{x}{2}=5-\dfrac{3\left(x+1\right)}{4}\)
Giải các phương trình:
1/ \(6x^4-x^3-7x^2+x+1=0\)
2/ \(\dfrac{2x-1}{3x^2+7x+2}+\dfrac{3}{9x^2+15x+4}-\dfrac{2x+7}{3x^2-5x-12}=\dfrac{5}{x+2}\)
1) giải pt :
a) \(\dfrac{7x+10}{x+1}\left(x^2-x-2\right)-\dfrac{7x+10}{x+1}\left(2x^2-3x-5\right)=0\)
b) \(\dfrac{13}{2x^2+x-21}+\dfrac{1}{2x+7}+\dfrac{6}{9-x^2}=0\)
c) \(\dfrac{x-49}{50}+\dfrac{x-50}{49}=\dfrac{49}{x-50}+\dfrac{50}{x-49}\)
d) \(\dfrac{1+\dfrac{x}{x+3}}{1-\dfrac{x}{x+3}}=3\)
1) Giải các phương trình sau :
a) \(\dfrac{2x+1}{3}-\)\(\dfrac{6x-1}{4}\) = \(\dfrac{2x+1}{12}\)
b) (4x+7)(x-3) - x\(^2\) = 3x (x+2)
mn giúp em với ạ
Giải các phương trình :
a) \(\dfrac{1}{2x-3}-\dfrac{3}{x\left(2x-3\right)}=\dfrac{5}{x}\)
b) \(\dfrac{x+2}{x-2}-\dfrac{1}{x}=\dfrac{2}{x\left(x-2\right)}\)
c) \(\dfrac{x+1}{x-2}+\dfrac{x-1}{x+2}=\dfrac{2\left(x^2+2\right)}{x^2-4}\)
d) \(\left(2x+3\right)\left(\dfrac{3x+8}{2-7x}+1\right)=\left(x-5\right)\left(\dfrac{3x+8}{2-7x}+1\right)\)
tìm điều kiện xác định của các phương trình sau
\(a,3x^2-2x=0\) \(b,\dfrac{1}{x-1}=3\)
\(c,\dfrac{2}{x-1}=\dfrac{x}{2x-4}\) \(d,\dfrac{2x}{x^2-9}=\dfrac{1}{x+3}\)
\(e,2x=\dfrac{1}{x^2-2x+1}\) \(f,\dfrac{1}{x-2}=\dfrac{2x}{x^2-5x+6}\)
giúp mik với , mik cần gấp