a, \(3x-5=13\Leftrightarrow3x=18\Leftrightarrow x=6\)
b, \(4x-2=3x+1\Leftrightarrow x=3\)
c, \(5\left(x-3\right)-2\left(x-5\right)=58\Leftrightarrow5x-15-2x+10=58\)
\(\Leftrightarrow3x-5=58\Leftrightarrow3x=63\Leftrightarrow x=21\)
d, \(mx+5x=m^2m^2-25\Leftrightarrow x\left(m+5\right)=m^4-25\)
mk quên phần cuối nhé
\(\Leftrightarrow x\left(m+5\right)=m^4-25\Leftrightarrow x=\frac{m^4-25}{m+5}\)
Bài 1:Thực hiện phép tính
a,(5-2x)(x+3)-4x(x+2) b,(3x+1)(x-3)-4(x+2)(x-2)
c,3(x-4)(x+3)+(x-5)(x+3) d,2x(x-4)+(3x-1)(2x-5)
Bài 2:Tìm x biết
a,5x(x+3)-(5x+2)(x+3)=7
b,(3x-1)(3x+2)-9(x+2)(x-2)=10
c,(x+1)(2x-5)+2(3-x)(x+2)=7
d,(1-3x)(x+2)+3x(x-5)=8
bài 1: phân tích đa thức thành nhân tử
a,2x+10y
b,x\(^2+4x+4\)
c,\(x^2-y^2+10y-25\)
bài 2 tìm x, biết
a,\(x^2-3x+x-3=0\)
b,\(2x\left(x-3\right)-\dfrac{1}{2}\left(4x^2-3\right)=0\)
c,\(x^2-\left(x-3\right)\left(2x-5\right)=9\)
tìm x biết
a,5x(x-4)3(x+2)(x-4)=2x(x+1)
b,4x(x+2)-x(8x-5)=10
c,(x+3)(2x-5)=2x(x+4)
d,(3x-2)(x+5)-3x(x+4)=5
e,x(x-3)+2x(x+1)=3(x mũ2-4)
Bài 2. (2điểm)Tìm x biếta) 3(2x –3) + 2(2 –x) = –3;b) (x –2021)(x –5) = x –2021;c) (2x –3)2–36x2= 0.
tìm x biết
a,2x+3(x-1)(x+1)=5x(x+1)
b,,(8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x)
c,, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Bài 3 : Tìm x biết
a) (x-2)^2-x(x-3)=0
b) (x+3)(2x+1)-2(x-1)^2=0
c) (4x-5)^2=9(2-5x)^2
d) X^2-6x-13=0
e) (x+2)(x^2-2x+4)-x(x^2+2)=15
f) X^3-6x^2+12x-19=0
Bài 5. Tìm x , biết rằng: a) x(x + 5)(x – 5) – (x + 2)(x2 – 2x + 4) = 3
b) (x – 3)3 – (x – 3)(x2 + 3x + 9) + 9(x + 1)2 = 15
c) (x+5)(x2 –5x +25) – (x – 7) = x3
d) (x+2)(x2 – 2x + 4) – x(x2 + 2) = 4
bài 1: giải phương trình
a, \(\dfrac{-3}{x^2-9}\)+ \(\dfrac{5}{3-x}\)=\(\dfrac{2}{x+3}\)
b, \(\left|x+5\right|\) = 2x-1
c, \(^{x^4}\)- \(^{x^3}\)+2\(^{x^2}\)-x + 1 = 0
tìm x , biết
a. 4x(x-5)-(x-1)(4x-3)=5
b. (3x-4)(x-2) = 3x(x-9)-3
c.2(x+3)-x2 -3x=0
d. 8x3-50x=0
e. (4x-30)2-3x(3-4x)
