\(=\left[\left(2x-1\right)-\left(3x+1\right)\right]\left[\left(2x-1\right)+\left(3x+1\right)\right]\\ =\left(2x-1-3x-1\right)\left(2x-1+3x-1\right)\\ =\left(-x-2\right)\left(5x-2\right)\)
ÁP dụng HĐT : \(a^2-b^2=\left(a-b\right)\left(a+b\right)\)
d) (3x – 5)(7 – 5x) – (5x + 2)(2 – 3x) = 4 g) 3(2x - 1)(3x - 1) - (2x - 3)(9x - 1) =0 j) (2x – 1)(3x + 1) – (4 – 3x)(3 – 2x) = 3 k) (2x + 1)(x + 3) – (x – 5)(7 + 2x) = 8 m) 2(3x – 1)(2x + 5) – 6(2x – 1)(x + 2) = - 6
Giải PT
1 ) (2x + 1)(3x – 2) = (5x – 8)(2x + 1)
2) 4x2 -1 = (2x + 1)(3x – 5)
3) (x + 1)2 = 4(x2 – 2x + 1)
4) 2x3+ 5x2 – 3x = 0
5) {2x{ = 3x – 2
6) x + 15 = 3x – 1
7) 2 – x = 0,5x – 4
Bài 1: Thực hiện phép tính:
a) 2x.(3x + 3) b) 5x.(3x2-2x + 1) c) 3x2(2x +4)
d) 5x2.(3x2 + 4x – 1) e) (x-1).(2x +3) f) (x+2).(3x-5)
Bài 2: Tìm x, biết:
a) 3x(x+1) – 3x2 = 6
b) 3x(2x+1) – (3x +1).(2x-3) = 10
giải bất phương trình sau và biểu diễn tập nghiệm trên trục số
(3x-1)-2(2x+1)>2x-3,
1-2x+3(x+1)<3x+5
3-2x+2(-1-2x)>4x-6
4x+2-(2-4x)<2x+1
3x-(2x+1) > 2-3x
(2x-1)-3(1+5x) > 1-5x
3-4(-x-3) < 3x+4
(-1-3x)+(3x-4) > 4x-1
3(1-x)-4(2x+3) > 3-7x
6(2x-6)-3(-1-3x) > 2x+5
3x-4(-1-x) < 2x+5
3x-4(3x+2) < 5x-5
mai phải nộp mong ae giúp
giải phương trình sau
1/ ( x-1) (2x+1) =0
2/ x (2x-1) (3x+15) =0
3/ (2x-6) (3x+4) x=0
4/ (2x-10)(x^2+1)=0
5/ (x^2+3) (2x-1) =0
6/ (3x-1) (2x^2 +1)=0
Rut gon cac bieu thuc sau:
1) A= (x2+3x+1)2 + (3x-1)2 - 2(x2+3x+1)(3x-1)
2) B= (3x2+3x+1)(3x3-3x+1) - (3x3+1)2
3) C= (2x2+2x=1)(2x2 - 2x+1) - (2x2+1)2
tìm x
1) (3x-2)(9x^2+6x+4)-(2x-5)(2x+5)=(3x-1)^3-(2x+3)^2+9x(3x-1)
2) (2x+1)^3-(3x+2)^2=(2x-5)(4x^2+10x+25)+6x(2x+1)-9x^2
. Tìm x, biết:
a) 6x.(x – 5) + 3x.(7 – 2x) = 18 b) 2x.(3x + 1) + (4 – 2x).3x = 7 c) 0,5x.(0,4 – 4x) + (2x + 5).x = -6,5 | d) (x + 3)(x + 2) – (x - 2)(x + 5) = 6 e) 3(2x - 1)(3x - 1) – (2x - 3)(9x - 1) = 0 |
giải các pt sau:
a)|2x+1|=4
b)|3x-2|+1=0
c)|3x+5|=2x-2
d)|x\(^2\)+1|=2x
e)|2x\(^2\)+3x+1|=|x+1|
Rút gọn biểu thức:
a) (x 2 – 2x + 2)(x 2 – 2)(x 2 + 2x + 2)(x 2 + 2)
b) (x + 1)2 – (x – 1)2 + 3x 2 – 3x(x + 1)(x – 1)
c) (2x + 1)2 + 2(4x 2 – 1) + (2x – 1)2
d) (m + n)2 – (m – n)2 + (m – n)(m + n)
e) (3x + 1)2 – 2(3x + 1)(3x + 5) + (3x + 5)2
