(x+1)(x2-x+1)-x(x-3)(x+3)=8
x3+1-x(x2-9)=8
x3+1-x3-9x=8
(x3-x3)+(1-8)-9x=0
-7-9x=0
-9x=-7
x=7/9
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19 Tìm x, biết
a) (x+2)(x+3)-(x-2)(x+5)=0 ; b) (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
c) (8-4x)(x+2)+4(x-2)(x+1)=0 ; d) (2x-3)(8x+2)=(4x+1)(4x-1)-3
Tìm x biết :
a) (x+3)2-(x-4) (x+8)=1
b) (x-1)3-(x3+27)+3(x2-4)=2
Tìm x biết :a) left(x-2right)^3+6left(x+1right)^2-x^3+120b) left(x-5right)left(x+5right)-left(x+3right)^3+3left(x-2right)^2left(x+1right)^2-left(x+4right)left(x-4right)+3x^2c) left(2x+3right)^2+left(x-1right)left(x+1right)5left(x+2right)^2-left(x-5right)left(x+1right)+left(x+4right)^2d) left(1-3xright)^2-left(x-2right)left(9x+1right)left(3x-4right)left(3x+4right)-9left(x+3right)^2
Đọc tiếp
Tìm x biết :
a) \(\left(x-2\right)^3+6\left(x+1\right)^2-x^3+12=0\)
b) \(\left(x-5\right)\left(x+5\right)-\left(x+3\right)^3+3\left(x-2\right)^2=\left(x+1\right)^2-\left(x+4\right)\left(x-4\right)+3x^2\)
c) \(\left(2x+3\right)^2+\left(x-1\right)\left(x+1\right)=5\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)+\left(x+4\right)^2\)
d) \(\left(1-3x\right)^2-\left(x-2\right)\left(9x+1\right)=\left(3x-4\right)\left(3x+4\right)-9\left(x+3\right)^2\)
tìm x, biết :
a) (x - 2)2 -(x + 3)2 -4( x + 1) =5
Tìm x biết
a) 2x2+3.(x-1).(x+1)=5x.(x+1)
b) (8-5x) (x+2)+4(x-2)x+1+2(x-2)(x+2)=0
tìm đa thức bậc 3 P(x) biết P(x) chia cho (x-1),(x+2),(x-4) đều dư 6 và P(-1)=16
bài 2:
a) x2+2/x3-1 + 2/x2+x+1 + 1/1-x
b) 9/x3-9x - (-1)/x+3
c) x3-8/5x+10 . x2+4x/x2+2x+4
d)5x+10/4x-8 . 4-2x/x+2
e) (x-13)2/2x5 . (-3x2)/x-13
g) x2+6x+9/1-x . (x-1)2/2(x+3)2
Bài 1: Áp dụng những hằng đẳng thức để tìm x
a) -(x+3)(x-4)+(x+1)(x-1)=10
b) (2x-1)(x-2)-(x+3)(2x-7)=3
c) (x-5)(4-x)-(x-1)(x+3)=-2x
d) 3(x+7)(x-7)-(x-1)(3x+2)=13
e) 5(x-3)(x-7)-(5x+1)(x-2)=8
f) (3x-4)(x-2)=3x(x-9)-10
g) 5x(x-3)=(x-2)(5x-1)-5
h) 6(x-3)(x-4)-6x(x-2)=4
i) (x-2)(x+3)-(x+4)(x-7)=5-x
k) (4x-5)(x+1)-4(x-1)(x+1)=7
l) (3x-4)(x-2)=3x(x-9)-3
18 Rút gọn biêu thức sau:
a) 2x^2+3(x-1)(x+1)-5x(x+1) ; b) (8-5x)(x+2)+4(x-2)(x+1)
c) 4(x-1)(x+5)-(x+2)(x+5)-3(x-1)(x+2)