\(\left(x^2-2x+3\right)\left(\dfrac{1}{2}x-5\right)=\dfrac{1}{2}x^3-5x^2-x^2+10x+\dfrac{3}{2}x-15=\dfrac{1}{2}x^3-6x^2+11,5x-15\)
Bài 1 làm tính nhân
2x.(x^2-7x-3)
(-2x^3+y^2-7xy).4xy^2
(-5x^3).(2x^2+3x-5)
(2x^2-xy+y^2).(-3x^3)
(x^2-2x+3).(x-4)
(2x^3-3x-1).(5x+2)
Bài 2 Thực hiện phép tính
A,(2x+3y^2)
B, (5x-y)^2
C, (2x+y^2)^3
D, ( 3x^2-2y)^3
Tính(rút gọn)
1, x^ 2 - 2x + 5 - (x - 7)(x + 2)
2,-5x(x-5)+(x-3)(x^2-7)
3, x(x^2-x-2)-(x+5)(x-1)
4, (-x+5)(x+3)+(2x-1)(x+3)
5, -4x(x+3)(x-4)-3x(x^2-x+1)
Bài 1 : Tìm x, biết
a) 3x(x2 - 2) + x2(1-2x) - x2 = -12
b) 3x(2x +3) - (2x +5)(3x -2) = 8
c)3(3x -1)(2x+5) - 6(2x -1)(x+2) = -6
d) 3(2x -1)(3x - 1)- (2x -3)(9x -1) - 3 = -3
e) 4x(x-1)- 3(x2 -5)- x2 = (x-3)(x+4)
f) (3x-1)(2x+7)-(x+1)(6x-5)= (x+2)-(x-5)
Tìm x:
1. 3x (2x + 3) - (2x + 5).(3x - 2) = 8
2. 4x (x -1) - 3(x2 - 5) -x2 = (x - 3) - (x + 4)
3. 2 (3x -1) (2x +5) - 6 (2x - 1) (x + 2) = -6
4. 3 ( 2x - 1) (3x - 1) - (2x - 3) (9x - 1) - 3 = -3
5. (3x - 1) (2x + 7) - ( x + 1) (6x - 5) = (x + 2) - (x - 5)
6. 3xy (x + y) - (x + y) (x2 + y2 + 2xy) + y3 = 27
7. 3x (8x - 4) - 6x (4x - 3) = 30
8. 3x (5 - 2x) + 2x (3x - 5) = 20
HELP ME T^T
Tính(rút gọn)
1) (-x+5)(x+3)+(2x-1)(x+3)
2) -4x(x+3)(x-4)-3x(x^2-x+1)
Tìm x, biết:
a) 3x(4x-3) - 2x(5-6x) = 0
b) 5(2x-3) + 4x(x-2) + 2x(3-2x) = 0
c) 3x(2-x) + 2x(x-1) = 5x(x+3)
d) 3x(x+1) - 5x(3-x) + 6(x2 + 2x + 3) = 0
Rút gọn biểu thức sau:
a. A= ( 5- x ). (x + 5) - 2.( x - 1). ( x - 3) - 3.( x - 2)2
b. B= ( 3 - 2x).( x - 2) + ( 2x - 5)2 - ( x - 4)
c. C= ( x - 4). ( x - 2) - 3.( x - 2) . ( 3 - 2x) - ( 2x + 1)2
d D= 2.( x - 1)2 - 3.( x - 1). ( x + 2) - ( 2x + 1)2
a) (x^2+2x+1)(x+1)
b) (x^3-x^2+2x-1)(5-x)
c) (x-5)(x^3-x^2+2x-1)
Bài 1:Tìm x, biết
a) 4x(x-1)-3(x2-5)-x2=(x-3)-(x+4)
b) 2(3x-1)(2x+5-6)(2x-1)(x+2)=6
c) 3(2x-1)(3x-1)-(2x-3)(9x-1)-3=-3
1. (2x +3) (x- 5) +(X-4 ) + (x-5) ( x-2 0 = (3x -5) ( x-4)
2. (8x-3) (3x +2) - (4x+ 7) (x+4) = (2x + 1) (5x-1)
3. 2x^2 + (x -1) (x+1)= 5x (x+10
4. 4- ( x-1) (x+5) - (x+2) (x+5) = 3(x-1) (x+2)