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nguyenthithanhmai1710
2 năm trước
ca1 .trung binh cong cua hai so la 100 hai so do hon kem nhau 2 don vi cau2 ,Mot hinh chu nhat co chu vi 368m.Neu tang chieu rong them 16 cm va giam chieu dai di 20 cm thi ta duoc mot hinh vuong.Tinh dien tich hinh chu nhat cau3. tim so nho nhat co 4 chu so sao cho so do chia cho 987 duoc so do du la so du lon nhat co the ? cau4. quy dong mau so cac phan so , 5 phan 4 , va 7 phan 12 , 1 phan 3 va 5 phan 9 . cau 5, tim x a,28964 : x = 4 b,x : 8 = 2512 x 14 cau6, Mot cua hang co 250kg gao.Buoi sang da ban 50kg gao,buoi chieu ban 1phan 5 so gao con lai.Hoi ca hai buoi cua hang da ban duoc bao nhieu kg gao ? cau 7, tinh nhanh 250 x 15 + 250 x 50 + 250 x35 cau 8, Hien nay, anh hon em 5tuoi.Sau 5 nam nua , tuoi anh va tuoi em cong lai duoc 25 tuoi . TINH TUOI CUA MOI NGUOI HIEN NAY
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