hay viet tông dai so :-15 + 8 - 25 + 32 than 1 day nhung pep cong

khi thuc hien phep cong hau so vi so y nen mot hoc sinh da viet sai o hang don vi cua so hang thu nhat 2 thanh 9 o hang chuc 4 thanh 7 vi the tong tim duoc la 750 hay tim tong dung cua phep cong do

khi cong mot so tu nhien voi 207, ban an da viet nham so 207 thanh 2007 nen duoc ket qua la 2015. Em hay tim tong dung cua phep cong do

khi thuc hien phep cong hai so thap phan, mot ban hs da viet nham dau phay cua mot so hang sang ben phai mot hang do do ket qua la 52,58.hay tim hai so do biet tong la 19,13

khi thuc hien phep cong cac so thap phan mot ban da viet nham dau phay cua mot so hang sang ben phai 1 hang do do duoc ket qua la 692,22.Ban hay tim 2 so do biet rang tong dung bang 100,56

cho phep chia 72/8.hay tim mot so sao cho khi lay so bi chia tru cho so do va lay so chia cong voi so do thi duoc hai so moi co thuong bang 1.

ket qua la :32. nhung co ai biet canh lam khong. 

Ban an phai thuc hien phep chia mot so cho 678 .Nhung vi so y nen ban an da viet sai so nhu sau : chu so hang nghin la 2 thanh 5 chu so hang don vi la 5 thanh 2 vi thephep chia sai co thuong la 22 va du 426 hay tim thuong va so du trong phep chia dung

khi thuc hien phep cong hai so thap phan, ban an da viet nham dau phay cua mot so hang sang ben trai mot hang nen tong tim duoc la 36,074. tim hai so hang do biet tong dung la 149,96

thanh dai la co day du nhung dk thuan loi de thanh kinh do ms cua nuoc ta

lm bài van viet theo tong phan hop