Violympic toán 8
Các câu hỏi tương tự
Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
a) -3x(x+2)²+(x+3)(x-1)(x+1)-(2x-5)²
b) 2(x-3)(x+3)(x+2)-(x-1)(x²-3)-5x(x+4)²-(x-5)²
c) 2x (x - 4)²(x + 5)(x - 2)(x + 2)+2(x + 5)² - (x - 1)²
d) (x + 5)² - 4 x (2 x + 3)²(2 x - 1)(x + 3)(x- 3)
e) -2 x( 3 x + 2)(3 x -2)+ 5( x + 2)²- (x -1) (2 x - 1)(2x +1)
f) (7 x - 8)(7 x + 8) - 10(2x + 3)² + 5 x (3x - 2)² - 4 (x - 5)².
g) (x²- 3)(x² + 3)- 5x²(x + 1) -(x² - 3x) (x² - 2x) + 4x(x + 2)².
23 tháng 3 2020 lúc 13:57
Giải phương trình:
1. (x - 5)2 + (x + 3)2 = 2(x - 4)(x + 4) - 5x + 7
2. (x + 3)(x - 2) - 2(x + 1)2 = (x - 3)2 - 2x2 + 4x
3. (x + 1)3 - (x + 2)(x - 4) = (x - 2)(x2 + 2x + 4) + 2x2
4. (x - 2)3 + (x - 5)(x + 5) = x(x2 - 5x) - 7x + 3
5. (x + 4)(x2 - 4x + 16) - x(x - 4)2 = 8(x - 3)(x + 3)
Rút gọn cac biểu thức sau :
A-(x-3).(x-7)-x(x+6)+16x-3
B= (x-3) 2-2(x2-9)+(3+x)2
C=2(x-1)2-(x+2)(x-3)-(x+3)(x-3)-7
tìm x:
a) (x-5)(x+5)-(x-2)^2-7x^2+(x+1)(x^2-x+1)=(x+3)^3-(x^3+9x^2)
b) (2x+3)^2+(x-1)(x+1)=5(x+2)^2-(x-5)(x+1)+(x+4)^2
23 tháng 3 2020 lúc 14:07
Giải phương trình:
1) (x - 5)2 + (x + 3)2 2(x - 4)(x + 4) - 5x + 7
2) (x + 3)(x - 2) - 2(x + 1)2 (x - 3)2 - 2x2 + 4x
3) (x + 1)3 - (x + 2)(x - 4) (x - 2)(x2 + 2x + 4) + 2x2
4) (x - 2)3 + (x - 5)(x + 5) x(x2 - 5x) - 7x + 3
5) (x + 4)(x2 - 4x + 16) - x(x - 4)2 8(x - 3)(x + 3)
6) 4(x - 1)(x + 2) - 5(x + 7) (2x + 3)2 - 5x + 3
7) (x - 1)(x2 + x + 1) + 3(x - 2)2 x(x2 + 3x - 1)
8) (x + 5)(x - 5) - (x + 3)(x2 - 3x + 9) 5 - x(x2 - x -2)
9) (x + 2)2 - 2(x + 3)(x - 4) 5 - x(x - 3)
10)...
Đọc tiếp
Giải phương trình:
1) (x - 5)2 + (x + 3)2 = 2(x - 4)(x + 4) - 5x + 7
2) (x + 3)(x - 2) - 2(x + 1)2 = (x - 3)2 - 2x2 + 4x
3) (x + 1)3 - (x + 2)(x - 4) = (x - 2)(x2 + 2x + 4) + 2x2
4) (x - 2)3 + (x - 5)(x + 5) = x(x2 - 5x) - 7x + 3
5) (x + 4)(x2 - 4x + 16) - x(x - 4)2 = 8(x - 3)(x + 3)
6) 4(x - 1)(x + 2) - 5(x + 7) = (2x + 3)2 - 5x + 3
7) (x - 1)(x2 + x + 1) + 3(x - 2)2 = x(x2 + 3x - 1)
8) (x + 5)(x - 5) - (x + 3)(x2 - 3x + 9) = 5 - x(x2 - x -2)
9) (x + 2)2 - 2(x + 3)(x - 4) = 5 - x(x - 3)
10) (x + 7)(x - 7) - (x + 2)2 = 5(x - 2) + (x - 7)
_Làm hộ với!_
a) x+2/x-2-1/x=2/x*(x-2)
b)2/2x-6+2/2x+2+2x/(x+1)*(3-x)=0
c) x+1/2017+x+2/2016=x+3/2015+x+4/2014
d) x-45/5+x-44/6+x-43/7+x-42/8=4
e) x-3/2011+x+2/2012=x-2012/2+x-2011/3
Tìm x
a)(2x+1)2-4(x+2)2 =9
b)(3x-1)2 +2(x+3)2 +11(x+1)(1-x)=6
c)(x+1)3 - x2 (x+3)=2
d)(x-2)3 -x(x+1)(x-1)+6x2 =5
e)(x-3)(x2 +3x +9)-x(x+4)(x-4)=5
g)(x-2)3 -(x+5)(x2 -5x+25)+6x2 =11
Thực hiện phép tính:
a) dfrac{x+1}{x+2}:left(dfrac{x+2}{x+3}:dfrac{x+3}{x+1}right)
b, dfrac{8}{left(x^2+3right)left(x^2-1right)}+dfrac{2}{x^2+3}+dfrac{1}{x+1}
c, dfrac{x+y}{2left(x-yright)}-dfrac{x-y}{2left(x+yright)}+dfrac{2y^2}{x^2-y^2}
d,dfrac{x-1}{x^3}-dfrac{x+1}{x^3-x^2}+dfrac{3}{x^3-2x^2+x}
Đọc tiếp
Thực hiện phép tính:
a) \(\dfrac{x+1}{x+2}:\left(\dfrac{x+2}{x+3}:\dfrac{x+3}{x+1}\right)\)
b, \(\dfrac{8}{\left(x^2+3\right)\left(x^2-1\right)}+\dfrac{2}{x^2+3}+\dfrac{1}{x+1}\)
c, \(\dfrac{x+y}{2\left(x-y\right)}-\dfrac{x-y}{2\left(x+y\right)}+\dfrac{2y^2}{x^2-y^2}\)
d,\(\dfrac{x-1}{x^3}-\dfrac{x+1}{x^3-x^2}+\dfrac{3}{x^3-2x^2+x}\)