题目

计算: (1) ; (2) ; (3) ; (4) ( ) . 答案: 解: 24+54 = 4×6+9×6 = 26+36 = 56 解: 18−32+2 = 9×2−16×2+2 = 32−42+2 =0 解: 12×20×75 = 4×3×4×5×25×3 = 23×25×53 = 605 解: (48−108)÷27 = (16×3−36×3)÷27 = −23÷(33) = −23
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