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tranphuongnhung.2704
2 năm trước
cùng 1 lúc AN đi ô tô từ A đến B,Bình đi ô tô từ B đến A. Sau 3 giờ 2 ô tô gặp nhau tại địa điểm C.biết rằng quãng đường ABdài 252km và quãng đường AC bằng 3/4 quãng đưỡng CB. hỏi trung bình mỗi giờ ô tô của Bình đi đk bao nhiêu km? 2.cho phân số 25/37.hỏi phải bớt ở cả tử số và mẫu số của phân số đã cho cùng một số nào để được một phân số mà sau khi rút gọn thì đk phân số 1/2. 3.tìm 1 số có 3 chữ số bết rằng nếu viết thêm chữ số 4 vào bên phải số đó thì được số mới hơn số phải tìm là 111. 4.tìm 1 số có 4 chữ số biết rằng khi viết thêm chữ số 2 vào bên trái số đó thì đk số mới gấp 17 lần số phải tìm 5.thay chữ số thích hợp vào dấu * 31* phép tính đó là.................................................................................................. x 54 = **** ***0 = ****4
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