1.chung minh rang;neu mot so co ba chu so ma chu so hang chuc va hang don vi giong nhau va tong ba chu so do chia het cho bay thi so do cung chia het cho bay
2,ba lop 6 cua truong thcs nguyen thai binh co120 hoc sinh.So hoc sinh lop 6a chiem 35%hoc sinh cua khoi.So hoc sinh lop 6b
bang \(\frac{20}{21}\)so hoc sinh lop 6a.Con lai so hoc siinh lop6c tinh so hoc sinh moi lop
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