(-2x^3) . (x^2+5x-1/2)

help me

nhan da thuc 1 phần 2 xy -1 với đa thức x^3 - 2x -6

Tìm x, biết:

\(\left(12x-5\right).\left(4x-1\right)+\left(3x-7\right).\left(1-16x\right)=81\)

@Liana, @Love Seven giúp mik!!!!!

Rút gọn biểu thức:

a, \(2x^2\)+3( x+1).( x-1) - 5x.(x+1)

b, (4x+3y).( 2x-5y) - ( 2x +6y).( 3x-5y)

c,( \(2x^3\)+3y).(\(2x^4y\)- \(3x^2y^2\)+ \(4y^3\))

Rút gọn các biểu thức sau:

a, (x+3).( 2x-1) - 2x.( x-4)

b, ( 3x-2) .( 2x-3) - 5.(\(x^2\)+4)

c, 2x (\(x^2\)+1) - ( 2x-5).( \(x^2\)- 6)

16 Tìm x, biết

a) 4(x+2)-7(2x-1)+9(3x-4)=30 ; b) 2(5x-8)-3(4x-5)=4(3x-4)+11

c) 5x(1-2x)-10(x+8)=0 ; d) (5x-3).4x-2x.(10x-3)=15

tính giá trị cua biểu thức

3x(5x^2-4)+x^2(8-15x^2)-8x^2 tại x=3; x=-3

help me! cần gấp!

1 Tính:

a){4x-2(x-3)-3[x-3(4-2x)+8]}.(-3x).

b)5(3x2+4y3)+[9(2x2-y3)-2(x2-5y3)]

2 Tìm x biết:

a)5x(1-2x)-3x(x+18)=0

b)5x-3{4x-2[4x-3(5x-2)]}=182

Tìm x biết:

1. -3x(x-5)+5(x-1)+3x2=4-x

2. 7x(x-2)-5(x-1)=21x2-14x2+3

3. 3(5x-1)-x(x-2)+x2-13x=7

4. \(\dfrac{1}{5}\)x(10x-15)-2x(x-5)=12

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