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kabby
2 năm trước
câu1: viết các tích sau dưới dạng một lũy thừa: a) 4.4.4.5.5.5 b) 100.10.2.5 c) 8 mũ hai.32 mũ 4 câu2: viết các thương sau dưới dạng một lũy thừa: a)7 mũ 5:7 mũ 2 b) 7 mũ 7 : 7 mũ 6 c) 7 mũ 8 :7 mũ 8 d)7 mũ 5: 7 câu3: tìm x : a) 165:x=5 b) 4 mũ x =64 câu4: so sánh: a) 3 mũ 500 và 7 mũ 300 b) 27 mũ 5 và 243 mũ 3 câu5: khối lượng trái đát bằng 6.10 mũ 21 tấn ,khối lượng mặt trời bằng 198.10 mũ 25 tấn.khối lượng mặt trời gấp bao nhiêu lần khối lượng trái đất
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