`a,x(3x+1)-5`
`=3x^2+x-5`
`b, (x-5)^2(3x-2)(3x+2)`
`= (x^2-10x+25)(9x^2-4)`
`= 9x^4 - 4x^2 - 90x^3 + 40x + 225x^2 - 100`
`= 9x^4 -90x^3 +221x^2 + 40x-100`
a/ (x+1) ² - (x-1) ² - 2(x+1)(x-1)
b/ 5(x+2)(x-) - 1/2 . (6-8x) ² + 17
c/ (3x+1) ² - 2(3x+1)(3x+5)+(3x+5) ²
1 Tìm x
a,(2.x-5)2-(2.x-3)(2x+3)=5
b,(x+3)3-x(x+4)(x-4)=27
c,(3x-2)2-(3x+5)2=4
d, (3x+5)2-(x-3)2=0
Rút gọn :
1. (2x-5)(3x+1)-(x-3)^2+(2x+5)^2-(3x+1)^3
2. (2x-1)(2x+1)-3x-2)(2x+3)-(x-1)^3+(2x+3)^3
3. (x-2)(x^2+2x+4)-(3x-2)^3+(3x-4)^2
4. (7x-1)(8x+2)-(2x-7)^2-(x-4)^3-(3x+1)^3
5. (5x-1)(5x+1)-(x+3)(x^2-3x+9)-(2x+4)^2-(3x-4)^2+(2x-5)^3
6. (4x-1)(x+2)-(2x+5)^2-(3x-7)^2+(2x+3)^3=(3x-1)^3
\(1, (-x+5)(x-2)+(x-7)(x+7)=(3x+1)^2-(3x-2)(3x+2)\)
\(2, (5x-1)(x+1)-2(x-3)^2=(x+2)(3x-1)-(x+4)^2+(x^2-x)\)
3, \((x-7)(x+1)-(x-3)^2=(3x-5)(3x+5)-(3x+1)^2 +(x-2)^2-x^2\)
27x^3 - 27 x^2 +3x - 1
1/27 + x^3
x^3- 3x^2+3x-1
0,001-1000x^3
12/5 x^2y^2-9x^4 - 4/25y^4
a^2y^2+b^2x^2-2axby
100-(3x-y)^2
64x^2-(8a+b)^2
27x^3-a^3b^3
1 Tìm x
a,(2.x-5)2-(2.x-3)(2x+3)=5
b,(x+3)3-x(x+4)(x-4)=27
c,(3x-2)2-(3x+5)2=4
d, (3x+5)2-(x-3)2=0
1 Tìm x
a,(x+3)3-x(x+4)(x-4)=27
b,(3x-2)2-(3x+5)2=4
c, (3x+5)2-(x-3)2=0
a, (3x+5)2-(x+3)2-8x(x+3)=12
b, (2x-5)2-(x-2)2-(x-1)(3x+2)=8
c, -2x(x+3)+(2x-5)2=-3(x+2)
tìm x?
chứng minh biểu thức sau kg phụ thuộc vào x
1. A= 3 ( x+1)2 - (x+3)2
2. B= ( x-2)2 - (x-4)x
3. C= 3. ( x+2) 2 -3 ( x2-4x)
4. D= 3x( x-2) (x+2) -x(3x+3)
5. E=x2 -(x+1) (x-1) +5
6. F=( 3x+2)2 -(3x+2) (3x-2) -6x
7. G= (3x+5)2 - (2x-3)2 + 3( 6x-7)
8. H=( x+5)2 -x(x-5) -10x
9. J= (2x+1)2 +(-x-1)2 -4(x-1)(x+1)
10. R= (x+2)2 ( x+3)2 -2( 5x+1)
