` (x+2).(x-2)-(x-3).(x+1)`
`=x^2 -2^2 -(x^2 + x - 3x - 3)`
`= x^2 -4 - x^2- x + 3x +3`
`= 2x -1`
Đúng 2
Bình luận (0)
Các câu hỏi tương tự
a, 2.x.(x-1)^2-3.x.(x+3).(x-3)-4.x.(x+1)^2
b,(a-b+c)^2-(b-c)^2+2.a.b-2.a.c
c,(3.x+1)^2-2.(1+3.x).(3.x+5)+(3.x+5)^2
d, (3+1).(3^2+1).(3^4+1).(3^8+1).(3^16+1).(3^32+1)
e, (a+b-c)^2+(a-b+c)^2+(b-c-a)^2+(c-a-b)^2
tính :
a, (x+1).(1+x-x^2+x^3-x^4)-(x-1).(1+x+x^2+x^3+x^4)
b, (2 b^2-2-5b+6b^3) . (3+3b^2-b)
1.Tìm xa) (x - 5)(x + 5) - (x + 3)^2 + 3 (x - 2)^2 (x + 1)^2 - (x + 4)(x - 4) +3x^2b) (2x + 3)^2 + (x - 1)(x + 1) 5 (x + 2)^2 - (x - 5)(x + 1) + (x + 4)^2c) (-x + 5)(x - 2) + (x - 7)(x + 7) (3x + 1)^2 - (3x - 2)(3x + 2)d) (5x - 1)(x + 1) - 2(x - 3)^2 (x + 2)(3x - 1) - (x + 4)^2 + (x^2 - x)2.Rút gọn :a) A 3 (x - 1)^2 - (x + 1)^2 + 2(x - 3)(x + 3) - (2x + 3)^2 - (5 - 20x)b) B 5x (x - 7)(x + 7) - x (2x - 1)^2 - (x^3 + 4x^2 - 246x) - 175c) C -2x (3x + 2)^2 + (4x + 1)^2 + 2 (x^3 + 8x + 3x - 2 )...
Đọc tiếp
1.Tìm x
a) (x - 5)(x + 5) - (x + 3)^2 + 3 (x - 2)^2 = (x + 1)^2 - (x + 4)(x - 4) +3x^2
b) (2x + 3)^2 + (x - 1)(x + 1) = 5 (x + 2)^2 - (x - 5)(x + 1) + (x + 4)^2
c) (-x + 5)(x - 2) + (x - 7)(x + 7) = (3x + 1)^2 - (3x - 2)(3x + 2)
d) (5x - 1)(x + 1) - 2(x - 3)^2 = (x + 2)(3x - 1) - (x + 4)^2 + (x^2 - x)
2.Rút gọn :
a) A= 3 (x - 1)^2 - (x + 1)^2 + 2(x - 3)(x + 3) - (2x + 3)^2 - (5 - 20x)
b) B= 5x (x - 7)(x + 7) - x (2x - 1)^2 - (x^3 + 4x^2 - 246x) - 175
c) C = -2x (3x + 2)^2 + (4x + 1)^2 + 2 (x^3 + 8x + 3x - 2 ) - (5 - x)
Rút gọn biểu thức :
A =x^2*(a-b) + b*(1-x)+x*(b*x+x) -a*x*(x+1)
B =x^2*(11*x-2)+ b*(x-1)-3*x*(4*x^2-x-2)
D = 2*x^2 +3*(x-1)*(x+1) -5*x*(x-1)
a. 3( 1 - 4x )( x - 1) + 4( 3x + 2 )( x + 3 ) = 38
b. 5( 2x + 3 )( x + 2 ) + 4( x - 2 )( x + 1 ) + 2( x - 2 )( x + 2 ) = 0
c. 2x2 + 3( x - 1 )( x + 1 ) = 5x( x + 1 )
d. ( 8 - 5x )( x + 2 ) + 4( x - 2 )( x + 1 ) + 2( x - 2 )( x + 2 ) = 0
e. ( x - 2 )( x + 1) = x( 2x + 1 ) + 2
Giúp mình với ạ ! Mình đang cần gấp
1, thực hiện phép tính
a, (x+1).(1+x-x^2+x^3-x^4)-(x-1).(1+x+x^2+x^3+x^4)
b, (2 b^2-2-5b+6b^3) . (3+3b^2-b)
Bài 2:Tính:
a,(x- 6y) (x+6y)
b,(x-2) (x2 +2x+4)
Bài 3:Rút gọn:
a,(x+1)2 - (x-1)2 - 3 (x+1) (x-1)
b,(x - 1)3 - ( x-1) 3 + 6 (x-1) (x+1)
a, (3x+2)2 - (3x-2)2 =5x+38 b, 3(x-2)2 +9(x-1) =3(x2+x-3)
c, (x+3)3 -(x-3)2 -(x-3)2 =6x+18 d, (x-1)3-x(x+1)2=5x(2-x)-11(x+2)
e, (x+1)(x2-x+1)-2x=x(x-1)(x+1) f, (x-2)3+(3x-1)(3x+1)=(x+1)3
tìm x: part 1 : a,(x^3)^2-(x+1)(x-1)=1 b,(x-2)^2-3(x-2)=0 c,(x+2)(x^2-2x+4)-x(x^2+2)=15 d,(x+1)^2-(x+1)(x-2)=0 e,4x(x-2017)-x+2017=0 f,(x+4)^2-16=0 part 2: a,x^3+27+(x+3)(x-9)=0 b,(2x-1)^2-4x^2+1=0 c,2(x-3)+x^2-3x=0 d,x^2-2x+1=6x-6 e,x^3-9x=0
Tìm min
A=(x-3)^2+(x+1)^2
B=(x+a)^2+(x+b)^2+(x+c)^2
C=2(x+1)^2+3(x+2)^2-4(x+3)^2
D=(x+1)(x+3)(x+5)(x+7)+20
E=(x-1)^2+(x+3)^2