a: Ta có: \(\left(x-2\right)^3-x\left(x+1\right)\left(x-1\right)+6x^2=5\)
\(\Leftrightarrow x^3-6x^2+12x-8-x^3+x+6x^2=5\)
\(\Leftrightarrow13x=13\)
hay x=1
1) (x-1)³+3(x-3)²-(x+2)(x²-2x+4)=(x+2)³-(x-3)(x²+9)-6x²+5
2) (x-5)(x+5)-(x-2)³-7x²+(x+1)(x²-x+1)=(x+3)³-(x³+9x²)
3) (x-4)³-(x+5)(x²+5x+25)=(x+2)(x-2x+4)-(x+4)³-(x-7)
4) (x+1)³-(x+3)(x²-3x+9)=(x-3)³+3(2x+1)²-(x³-5x+1)
I : Tìm giá trị lớn nhất của biểu thức
a) A=5x-x^2 b) B=x-x^2 c) C= 4x-x^2+3
d) D=-x^2+6x-11 e) E=5-8x-x^2 f) F=4x-x^2+1
* Tìm X
a/ ( x+2)2+ ( x-3)2 - 2(x-1)(1+x) = 9
b/ ( 3x - 1)2+ (3x+1)2- 18( x-2)(x+2) = 5
c/ ( 6x-5)2 - ( 6x +7)(6x-7) + 4( x-3) = 8
(x+1)3-(x-1)3-6(x-1)2=2
(x-2)-x(x+1)(x-1)+6x2=5
(x+2)3-x(x-1)(x+1)=6x2+21
(x+1)3-(x-1)3-6(x-1)2=-19
1, Tìm giá trị lớn nhất của biểu thức
a, A = 5x - x^2
b, B = x - x^2
c, C = 4x - x^2 + 3
d, D = -x^2 + 6x - 11
e, E = 5 - 8x - x^2
f, F = 4x - x^2 + 1
Tìm x, biết:
a)9x2–6x–3 = 0
b) (2x + 1)2–4(x + 2)2= 9
c)3(x –1)2–3x(x –5) = 21
d) (x + 3)2–(x –4)(x + 8) = 1
giúp mk với ạ
1)rút gọn
a) (x+5)(\(x^2\) - 5x + 25) - \(\left(x+3\right)^3\) + (x-2)(\(x^2\) + 2x + 4) - \(\left(x-1\right)^3\)
b)\(\left(x+3y\right)^3+\left(3x+2y\right)\left(9x^2-6xy+4y^2\right)-\left(2y-3x\right)^3\)
c)\(\left(3x+y\right)^3-\left(5x-y\right)\left(25x^2+5xy+y^2\right)+\left(x+2y\right)^3\)
2)tìm x,biết
a)\(\left(x-1\right)^2-\left(x-2\right)\left(x+3\right)+\left(x+2\right)^3=\left(x-3\right)\left(x^2+3x+9\right)+6x\left(x+2\right)\)
Cảm ơn các bạn ^^
1. -6x .(x2-5x+4)-(x+1)2
2. (X+3)2-4x(x-7)
3.(5x-2)2-(3x-2). (X+1)
Help me giúp nheeeennn. Tks
tìm x biết :
a, (x+2)2 + (x-3)2 - 2(x-1).(x+1) = 9
b, x(x+4)(4-x) + (x-5)(x2+5x+25) = 3
c, 3(x-1)2 - 3x(x-2) = 21
d, 4(x+1)2 + (2x-1)2 - 8(x-1)(x+1) = 11
