có số số hạng là :
(99-10):1+1=90(số)
tick nhé
có số số hạng là :
(99-10):1+1=90(số)
tick nhé
1 ,Tim so co 4 chu so biet chu so hang tram gap doi chu so hang chuc , chu so hang chua gap 3 lan chu so hang don vi
2, Tim 1 so co 2 chu so , biet neu so do chia cho chu so hang don vi cua no thi dc thuong = 6 va du 5
3,Tim so co 4 chu so biet neu xoa chu so hang chuc thi so do giam di 1188 don vi
4, Tim so co 3 chu so neu so do cong voi tong cac chu so cua no thi = 555
Giai Han Ra Nhe !
.
mot hoc sinh khi lam phep nhan mot so co 3 chu so voi so co 2 chu so.do so suat do da viet nham chu so hang don vi cua so co 2 chu so la 2 thanh 8 nen tich tim duoc la 2034.biet tich dung la 1356.tim so co 3 chu so
Tim so co 2 chu so, biet rang tong 2 chu so cua 2 so do bang 15 va biet neu doi vi tri 2 chu so cua so do cho nhau thi ta duoc so moi kem so phai tim 27 don vi.
tim so co 2 chu so biet rang neu ta viet them vao giua so do 1 so co 2 chu so kem so phai tim mot don vi thi so moi gap 91 lan so phai tim
tim 2 so khi biet tong la 11992 biet hieu cua chung la hieu cua so lon nhat co bon chu so va so lon nhat co ba chu so.
tim so co 2 chu so biet rang neu viet them chu so 1 vao giua 2 so thi ta co so moi gap 7 lan so can tim la 4 don vi
1 hoc sinh khi lam phep nhan 1 so co 3 so voi so co 2 chu so do so xuat hoc sinh do da viet nham chu so hang don vi cua so co 2 chu so la 2 thanh 8 nen tich tim duoc la 2034 biet tich dung la 1356 tim so co 3 chu so
tim 1 so co 2 chu so biet rang neu viet them vao ben trai ben phai so do 1 chu so 5 ta duoc 1 so moi co 4 chu so gap 75 lan so phai tim
trung binh cong cua 3 so la 369. biet trong 3 so do co 1 so co 3 chu so,so co 1 so co 2 chu so , 1 co 1 chu so. tim 3 so do
tim 1 so co 2 chu so biet rang them chu so 0 vao giua 2 chu so thi so do duoc mt so co 3 chu so gap 9 lan so ban dau