(6/(2√3))²=6²/(2√3)²=36/(2²·(√3)²)=36/(4·3)=36/12=3
<span>(2x - 7)(3x</span>² <span>+ x - 4) = 6х</span>³ + 2х² - 8х - 21х² - 7х + 28 = 6х³ - 19х² - 15х + 28<span>
6y - (y - 3)(y</span>² <span>- 2) = 6у - (у</span>³ - 2у - 3у² + 6) = 6у - у³ + 2у + 3у² - 6 = -у³ + 3у² + 8у - 6