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2 năm trước
a)tìm phân số a/b biết a/b=13/27 và BCNN(ab)=1053 b)chứng tỏ S=2+2^2+2^3+2^4+...+2^99+2^100 2)tính số hs của lớp trong khoảng từ 30 đến 50 em.Trong bài kiểm tra toán 1/8 số hs đạt loại giỏi 1/3 số học sinh đạt loại khá 1/2 số hs trung bình còn lại hs yếu .Hỏi lớp có bn hs mỗi loại giup mìinh với dang can gấp
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