3A. Rút gọn các biểu thức sau: a) 5x ^ 2 * (3x ^ 2 - 1) - 6x(4x ^ 3 - 3x + 1) - 2x ^ 3 * (3x - 1) b) 1/2 * x(x ^ 2 - 2/5 * x + 2) - 3/4 * x ^ 2 * (x + 1/3) - x(x + 1) c) 1 1/2 * x ^ 2 * (x ^ 2 - 2x) - 2x(x ^ 3 + x ^ 2 + 1) + 2(x - 1) d) x(x ^ 3 - 2x ^ 2) + 5x(x ^ 2 - 2x + 1/2) - x ^ 2 * (x ^ 2 - x + 1) . Rút gọn các biểu thức sau: 3B a) 3x(- x ^ 2 - 5) + 5x(x ^ 3 + 7) - 3x ^ 2 * (x ^ 2 - x + 5) + 2(4 - x) ; b) 25x - 4(3x - 1) + 7x(5 - 2x ^ 2) ; c) 4x(x ^ 3 - 4x ^ 2) + 2x(2x ^ 3 - 3x ^ 2 + 7x + 1) ; d) - 4/2 * x ^ 2 * (3x ^ 2 - 6x + 9) + 8x(x ^ 3 - 3x ^ 2 + 2x - 1) - x(x ^ 2 - 2x) 4A. Rút gọn các biểu thức sau: a) (4x - 1)(3x + 2) - 5x(x - 3) ; b) (5x - 2)(x + 1) - 2x(x ^ 2 + x - 3) ; c) (x + 1)(2x - 1) + x(x ^ 2 - x + 1) ; d) (3x ^ 2 + x + 2) * 0.3 - (2x + 1) * 0.2(3 + x) .
Rút gọn biểu thức :
a) (x-3)(x+5) - (x-2)(x+2)
b) (x-2)2 + (x+3)2 - 2(x-1)(x+1)
c) (x-2)2 + (x-1)(x2+x+1) - x(x-2)(x+2)
d) (2x-1)2 + (2x+5)2 - 2(2x+5)(2x-1)
e) (x+1)(x2-x+1) - (x-1)(x2+x+1) - x2
1. Thu gọn:
a) 5x. (x-3) - x. (5x+1)
b) -3x. (x-1) - x. (x+1) + 4x. (x-2)
c) (3x-1). (x-2) + (x-1). (x+1)
d) (4x-3). (2x-5) - (8x-2). (x-1)
2. Tìm x:
a) 3x. (x-3) - x. (3x-2) = 2
b) -2x. (x+1) - 3. (1-x) + 2x2
c) (x-2). (x+2) + (3.x). (x+1) = 0
d) (2x-1). (x+3)- (x-2). (2x+1) = 10
1. Thu gọn:
a) (3x-1). (x-2) + (x-1). (x+1)
b) (4x-3). (2x-5) - (8x-2). (x-1)
2. Tìm x:
a) 3x. (x-3) - x. (3x-2) = 2
b) -2x. (x+1) - 3. (1-x) + 2x2 = 3
c) (x-2). (x+2) + (3.x). (x+1) = 0
d) (2x-1). (x+3)- (x-2). (2x+1) = 10
Tìm x biết:
a)(x+3)^2+(x-2)(x+2)-2(x+1)=7
b)x(2x-1)-(x-2)(2x+3)=0
c)(x-1)(x+2)-x-2=0
d)x[(3x+2)+(x+1)^2-(2x-5)(2x+5)]=0
đ) 2x^2-7x+5=0
e) (2x+3)(x-5)=(2x+1)(2×+3)
a) 1-4x^2/x^2+4x : 2-4x/3x
b) x+1/x+2 : x+2/x+3 : x+3/x+1
c)x+1/x+2 : (x+2/x+3 : x+3/x+1)
d) (1/x^2+x - 2-2x/x+1):(1/x+x-2)
e) 5x-15/4x+4 : x^2-9/x^2+2x+1
trong các cách viết sau, cách viết nào đúng?
A.(x - y)(y + x)=y^2 - x^2
B. x^2 - 2x + 1=(x + 1)^2
C. (x - 2)^2 = x^2 - 2x + 4
D. (2x - 1)(4x^2 + 2x + 1)=8x^3 - 1
Tìm x,biết:
a) 3(2x-1) -5(x-3) +6(3x-4) = 24
b) 2x2 + 3(x2 -1) = 5x (x+1)
c) 2x(5-3x) + 2x(3x-5) -3(x-7) = 3
d) 3x(x+1) -2x(x+2) = -1-x
e) 3x(x-2) -x(1+3x) = 14
f) 2x(x+3) -3(x2 + 1) = x+1 -x(x-2)
giúp mik nha !!!! :D