a) (x + 2)2 - 2 (x - 3) = (x + 1)2
<=> x2 + 4x + 4 - 2x + 6 = x2 + 2x + 1
<=> x2 + 2x + 10 = x2 + 2x + 1
<=> x2 + 2x - x2 - 2x = 1 - 10
<=> 0x = -9
Vậy PT vô nghiệm
b) (x + 1)2 + (x + 2)2 = 2 (x + 4)2 - (22x + 27)
<=> (x2 + 2x + 1) + (x2 + 4x + 4) = 2 (x2 + 8x + 16) - 22x - 27
<=> x2 + 2x + 1 + x2 + 4x + 4 = 2x2 + 16x + 32 - 22x - 27
<=> 2x2 + 6x + 5 = 2x2 - 6x + 5
<=> 2x2 + 6x - 2x2 + 6x = 5 - 5
<=> 12x = 0
<=> x = 0 : 12
<=> x = 0
Vậy PT có nghiệm x = {0}
a) 2(x-1)2+(x+3)2=3(x-2)(x+1)
b) (x-1)2+(x-2)2=2(x+4)2-(22x+27)
c) x3-5x2+12x-5=0
d) (2x-1)2+(x+3)2-5(x+7) (x-7)=0
Bài 1: Tìm x, biết:
a, 2(x-1)^2+(x+3)^2=3(x-2)(x+1)
b, (x+2)^2-2(x-3)=(x+1)^2
c, (x-1)^2+(x-2)^2=2(x+4)^2-(22x+27)
Làm giúp mình với! Cảm ơn!
Tìm x (sử dụng HĐT)
a) (x - 1)2 + (x - 2)2 = 2(x + 4)2 - (22x + 27)
b) (x +2)2 - 2(x - 3) = (x + 1)2
c) (x + 1)3 - x2(x + 3) = 2
Tìm x:
a) (2x - 1) (x^2 - x + 1) = 2x^3 - 3x^2 + 2
b) (x + 1) (x^2 + 2x + 4) - x^3 - 3x^2 + 16 = 0
c) (x + 1) (x + 2) (x + 5) - x^3 - 8x^2 = 27
tìm x biết:
a) x - 3= (3 - x)^2
b) x^3 + 3/2x^2 + 3/4x + 1/8 = 1/64
c) 8x^3 - 50x = 0
d) (x - 2) (x^2 + 2x + 7) + 2(x^2 - 4) - 5(x - 2) = 0
e) x(x + 3) - x^2 - 3x = 0
f) x^3 + 27 + (x + 3) (x - 9) = 0
Giúp mik vs ạ
1.Rút gọn các biểu thức sau:
a) A=(x+2)(x2-2x+4)-(x3-2)
b) B=(a+2)(a-2)(a2+2a+4)(a2-2a+4)
2. Tìm x, biết:
a) 2(x-1)2+(x+3)2=3(x-2)(x+1)
b) (x+2)2-2(x-3)=(x+1)2
c) (x-1)2+(x-2)2=2(x+4)2-(22x+27)
3x^4 + 3x^2y^2 + 6x^3y - 27x^2
x^4 + x^3 - x^2 + x
2x^5 - 6x^4 - 2a^2x^3 - 6ax^3
x^5 + x^4 + x^3 + x^2 + x + 1
x^3 - 1 + 5x^2 - 5 + 3x - 3
1/4.(a + 1)^2 - 4/9.(a - 2)^2
12a^2b^2 - 3.(a^2b^2)^2
4x^2y^2 - (x^2 + y^2 - a^2)^2
(a + b + c)^2 + (a + b - c)^2 - 4c^2
x^3 - 1 + 5x^2 - 5 + 3x - 3
Bài 1 : Phân tích đa thức thành nhân tử
a) 5x^2y-20xy^2
b) 1-8x+16x^2-y^2
c) 4x-4-x^2
d) x^3-2x^2+x-xy^2
e)27-3x^2
f) 2x^2+4x+2-2y^2
Bài 2: tìm x, biết
a) x^2(x-2023)-2023+x=0
b) -x(x-4)+(2x^3-4x^2-9x):x=0
c) x^2+2x-3x-6=0
d) 3x(x-10)-2x+20=0
1.16x^3y + 0,25yz^3
2.x ^4 – 4x^3 + 4x^2
3.2ab^2 – a^2b – b^3
4.a^3 + a^2b – ab^2 – b^3
5.x^3 + x^2 – 4x - 4
6.x ^3 – x^2 – x + 1
7.x ^4 + x^3 + x^2 – 1
8.x ^2y^2 + 1 – x^2 – y^2
9.x^4 – x^2 + 2x – 1
10.3a – 3b + a^2 – 2ab + b^2
