24 * 9 + 12 * 27 = 12 *2 * 9 + 12*9*3 = 12* 9 * (2+3) = (12*5 )*9 = 60 *9 = 540
46*75 - 65*30 = 2*23 * 15*5 - 5*13*2*15 = (5*2)*15*(23-13)= 10 * 15 * 10 = 1500
24 * 9 + 12 * 27 = 12 *2 * 9 + 12*9*3 = 12* 9 * (2+3) = (12*5 )*9 = 60 *9 = 540
46*75 - 65*30 = 2*23 * 15*5 - 5*13*2*15 = (5*2)*15*(23-13)= 10 * 15 * 10 = 1500