Rút gọn:
A=(x^4 - 3x^2 + 9)(x^2 + 3) + (3 - x^2)^2
M= 5(x+2y)^2 - (3y + 2x)^2 + (4x - y)^2 + 3(x - 2y)(x + 2y)
E= (6x + 1)^2 + (6x - 1)^2 - 2(1 + 6x)(6x - 1)
C= (x^2 + 4)(x + 2)(x -2) - (x^2 - 3)^3
Tìm x Toán đại 8 Hằng đẳng thức đáng nhớ?
Tìm x:
1. (x-1)^3+3.(x-3)^2-(x+2).(x^2-2x+4) = (x+2)^3-(x-3).(x^2+9)-6x^2+5
2.(3+2x)^3-(6x-1).(6x+1) = (2x-1)^3+(x+4)^2-x^3+(x+1).(x^2+x+1)
rút gọn biểu thức
a)(x+y)^2-(x-y)^2
b)2.(x+y).(x-y)+(x+y)^2+(x-y)^2
c)(x+3).(x^2-3x+9)-(54+x^3)
d)(2x+y).(4x^2-2xy+y^2)-(2x-y)
e)(6x+1)^2+(6x-1)^2-2.(6x+1).(6x-1)
f)(a-b)^3-(a+b)^3+2b^3
1.Tính
a, 5x^3yz . (-7x^2y^3)
b, 6x(x-5) -x(6x+3)
c, (x-9)(x^2-2x-1)
2.Cho A (x)=10-2x+4x^3-5x^2
B(x)=-10x^3-5x+6x^2-20
Tính A(x)+B(x); A(x)-B(x)
3.Tìm nghiệm
a,M(x)= 5x+20
b,N(x)=100x^2-49
c,P(x)=3x-15
1.Tính
a, 5x^3yz . (-7x^2y^3)
b, 6x(x-5) -x(6x+3)
c, (x-9)(x^2-2x-1)
2.Cho A (x)=10-2x+4x^3-5x^2
B(x)=-10x^3-5x+6x^2-20
Tính A(x)+B(x); A(x)-B(x)
3.Tìm nghiệm
a,M(x)= 5x+20
b,N(x)=100x^2-49
c,P(x)=3x-15
1.Tính
a, 5x^3yz . (-7x^2y^3)
b, 6x(x-5) -x(6x+3)
c, (x-9)(x^2-2x-1)
2.Cho A (x)=10-2x+4x^3-5x^2
B(x)=-10x^3-5x+6x^2-20
Tính A(x)+B(x); A(x)-B(x)
3.Tìm nghiệm
a,M(x)= 5x+20
b,N(x)=100x^2-49
c,P(x)=3x-15
a, (2x + 3)^2 + (2x-3)^2 -2 (4x^2 -9) b,(x+3)^3 + (x-2)^3 + x^3 -3x (x+2) (x-2) bài 2:tính a,(6x^2 +y^2) (y^2 - 6x^2) b, (4x + 5) (16x^2 - 20x + 25)
Bài 3 : Tìm x biết
a) (x-2)^2-x(x-3)=0
b) (x+3)(2x+1)-2(x-1)^2=0
c) (4x-5)^2=9(2-5x)^2
d) X^2-6x-13=0
e) (x+2)(x^2-2x+4)-x(x^2+2)=15
f) X^3-6x^2+12x-19=0
P)(9-x)(x^2+2x-3) n)(-x+3)(x^2+x+1) O)(-6x+1/2)(x^2-4x+2) q)(6x+1)(x^2-2x-3) r)(2x+1)(-x^2-3x+1) U)(2x-3)(-x^2+x+6) s)(-4x+5)(x^2+3x-2) V)(-1/2x+3)(2x+6-4x^3)