Tính và thu gon:
\(\left(2x+1\right)^2-\left(4x-3\right)\left(x+7\right)-22\)
\(69x\left(3x^2-5x\right)-\left(3x+1\right)\left(9x^2-18x-1\right)\)
\(\left(1-2x\right)^3-4x^2\left(3-2x\right)+24x^2\)
\(\left(24x^2y^2z-36x^2y^2z^2-12x^2y^3z\right):12x^2yz\)
\(\left(2x+1\right)^2-\left(4x-3\right).\left(x+7\right)-22\)
\(=4x^2+4x+1-4x^2-28x+3x+21-22\)
\(=-21x\)
mấy câu khác tương tự