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vitconcatinh_foreverloveyou


em ho minh dang hoc lop 5 co bai toan kho wa minh nho cac ban lam giup
1, tong cua 2 so = 412. biet rang neu viet them mot chu so vao ben phai cua so be thi dc so lon. tim hai so da cho
2, cho hinh thang ABCD co day AB=15cm, day CD = 45cm. Hai duong cheo cua hinh thang cat nhau o E. Biet dt tam giac BEC la 30cm2. tim dt hinh thang ABCD.
3, TIm so thap phan a.b (a #b)sao cho a.b=(a+b)x0.5
giup minh nhe
thank nhieu
1, tong cua 2 so = 412. biet rang neu viet them mot chu so vao ben phai cua so be thi dc so lon. tim hai so da cho
2, cho hinh thang ABCD co day AB=15cm, day CD = 45cm. Hai duong cheo cua hinh thang cat nhau o E. Biet dt tam giac BEC la 30cm2. tim dt hinh thang ABCD.
3, TIm so thap phan a.b (a #b)sao cho a.b=(a+b)x0.5
giup minh nhe
thank nhieu