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Trang190920
2 năm trước
bài 1 : lớp 4A trồng được 43 cây , lớp 4B trồng được 65 cây , lớp 4C trồng được nhiều hơn cả hai lớp 4A và 4B gộp lại . hỏi cả 3 lớp trồng bn cây ? bài 2 : tìm x : 100 : x = 289 - 279 573 : x = 191 bài 3 : tính a)2647 + 74956 b) 5364-23354 c)53635 x 654 d) 533535 : 5
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