các cậu ơi giúp mik vs ạ
Bài 1:Rút gọn
a)\(\left(x-2\right)\)x\(\left(x^2+2x+4\right)\)-\(6x^2+12x\)
b)\(\left(2x+5\right)\)x\(\left(5-2x\right)+\left(x-5\right)\)x\(\left(5+4x\right)\)
c)\(4x^2+4x+1-\left(2x-1\right)^2\)
d)\(\left(x+5\right)\)x\(\left(x^2+5x+25\right)-10x\) x\(\left(x+5\right)-x^3\)