4(3x2-4)-6(2x2-2x)=-16
12x2-16-12x2+12x=-16
12x2-12x2+12x=16-16
12x=0
=>x=0
\(4\left(3x^2-4\right)-6\left(2x^2-2x\right)=-16.\)
\(12x^2-16-12x^2+12x=-16\)
\(12x^2-12x^2+12x=16-16\)
\(12x=0\)
Học tốt
thực hiện phép tính:
a,\(\left(9x^2y^3-15x^4y^4\right):3x^2y-\left(2-3x^2y\right)y^2\)
b,\(\left(6x^2-xy\right):x+\left(2x^3y+3xy^2\right):xy-\left(2x-1\right)x\)
c,\(\left(x^2-xy\right):x-+\left(6x^2y^5-9x^3y^4+15x^4y^2\right):\dfrac{3}{2}x^2y^3\)
Bài 1: Phân tích đa thức thành nhân tử:
1) \(3x^3y^2-6xy\)
2) \(\left(x-2y\right).\left(x+3y\right)-2.\left(x-2y\right)\)
3) \(\left(3x-1\right).\left(x-2y\right)-5x.\left(2y-x\right)\)
4) \(x^2-y^2-6y-9\)
5) \(\left(3x-y\right)^2-4y^2\)
6) \(4x^2-9y^2-4x+1\)
8) \(x^2y-xy^2-2x+2y\)
9) \(x^2-y^2-2x+2y\)
Bài 2: Tìm x:
1) \(\left(2x-1\right)^2-4.\left(2x-1\right)=0\)
2) \(9x^3-x=0\)
3) \(\left(3-2x\right)^2-2.\left(2x-3\right)=0\)
4) \(\left(2x-5\right)\left(x+5\right)-10x+25=0\)
\(\left(2x+4y\right)^2:\left(2x+4y\right)-\left(9x^3-12x^2-3x\right):\left(-3x\right)-3\cdot\left(x^2+3\right)\)
\(\left(13x^2y^2-5x^4+6y^4-13x^3y-13xy^3\right):\left(2y^2-x^2-3xy\right)\)
chia đa thức
Thực hiện phép tính
a, \(A=\left(3x^2y-11x^2-5y\right)\left(8xy-5x+6\right)\)
b,\(B=\left(-4x^2y-5x^2+3y^2\right)\left(2x^2-xy+3y^2\right)\)
c,\(C=5\left(2x-1\right)^2+4\left(x-1\right)\left(x+3\right)-2\left(3x-1\right)\left(3x+1\right)\)
Giải các phương trình sau:
f. 5 – (x – 6) = 4(3 – 2x)
g. 7 – (2x + 4) = – (x + 4)
h. \(2x\left(x+2\right)^2-8x^2=2\left(x-2\right)\left(x^2+2x+4\right)\)
i. \(\left(x-2^3\right)+\left(3x-1\right)\left(3x+1\right)=\left(x+1\right)^3\)
k. (x + 1)(2x – 3) = (2x – 1)(x + 5)
BÀI 6 tìm x
1,\(2x\left(x-5\right)-\left(3x+2x^2\right)=0\) 2,\(x\left(5-2x\right)+2x\left(x-1\right)=13\)
3,\(2x^3\left(2x-3\right)-x^2\left(4x^2-6x+2\right)=0\) 4,\(5x\left(x-1\right)-\left(x+2\right)\left(5x-7\right)=6\)
5,\(6x^2-\left(2x-3\right)\left(3x+2\right)=1\) 6,\(2x\left(1-x\right)+5=9-2x^2\)
Phân tích đa thức thành nhân tử
a) \(\left(x+y\right)\left(x+2y\right)\left(x+3y\right)\left(x+4y\right)+x^4\)
b) \(\left(x^2+4x+2\right)^2-3x\left(x^2+4x+2\right)+2x^2\)
c) \(4x^4-8x^3+3x^2-8x+4\)
d)\(2x^4-15x^3+35x^3-30x+8\)
Giải các phương trình sau:
1, \(\dfrac{x-1}{3}-x=\dfrac{2x-4}{4}\)
2, \(\left(x-2\right)\left(2x-1\right)=x^2-2x\)
3, \(3x^2-4x+1=0\)
4, \(\left|2x-4\right|=0\)
5, \(\left|3x+2\right|=4\)
6, \(\left|2x-5\right|=\left|-x+2\right|\)
*Giúp mình với mình đg cần gấp ạ T_T
TÌM MAX; MIN
1. \(-x^2-y^2+xy+2x+2y\)
2. \(\left(x-2\right)\left(x-5\right)\left(x^2-7x-10\right)\)
3.\(\left|x-4\right|\left(2-\left|x-4\right|\right)\)
4. \(\left(2x-1\right)^2-3\left|2x-1\right|+2\)
5. \(\left(x-1\right)\left(x+2\right)\left(x+3\right)\left(x+6\right)\)
6. \(\left(x+1\right)\left(x+2\right)\left(x+3\right)\left(x+4\right)\)
