Giúp mik vs ạ. Mik đang cần gấp lắm
1) Rút gọn các biểu thức sau:
a) \(\left(2x+1\right)^2+2\left(4x^2-1\right)+\left(2x-1\right)^2\)
b) \(\left(x^2-1\right)\left(x+2\right)-\left(x-2\right)\left(x^2+2x+4\right)\)
c) \(\left(3x-1\right)^2+2\left(3x-1\right)\left(2x+1\right)+\left(2x+1\right)^2\)
d) \(\left(x^2+1\right)\left(x-3\right)-\left(x-3\right)\left(x^2+3x+9\right)\)
e) \(\left(2x+3\right)^2+\left(2x+5\right)^2-2\left(2x+3\right)\left(2x+5\right)\)
f) \(\left(x-3\right)\left(x+3\right)-\left(x-3\right)^2\)
g) \(\left(3x+5\right)^2+\left(3x-5\right)^2-\left(3x+2\right)\left(3x-2\right)\)
h) \(\left(x-1\right)^3-\left(x+2\right)\left(x^2-2x+4\right)+3x^2-2x\)
i) \(\left(x^2-1\right)^3-\left(x^4+x^2+1\right)\left(x^2-1\right)\)
k) \(\left(x-1\right)^3-4x\left(x+1\right)\left(x-1\right)+3\left(x-1\right)\left(x^2+x+1\right)\)
1) Đơn giản các biểu thức sau rồi tính giá trị của chúng:
a) \(25x-4\left(3x-1\right)+7.\left(5-2x\right)\) \(với\) \(x=2,1\)
b) \(4a-2\left(10a-1\right)+\left(8a-2\right)\) \(với\) \(a=-0,2\)
c) \(3x\left(x-4y\right)-\left(y-5x\right).\dfrac{12}{5}y\) \(với\) \(x=-4;y=-5\)
d) \(2x\left(x-y\right)-y\left(y-2x\right)\) \(với\) \(x=\dfrac{-1}{3};y=\dfrac{-2}{3}\)
e) \(x\left(x^3-y\right)+x^2\left(y-x^2\right)-y\left(x^2-3x\right)\) \(với\) \(x=\dfrac{1}{4};y=-2005\)