Giup minh giai bai toan nay voi
Khong thuc hien phep tinh xet xem tich sau co tan cung bang chu so nao
a.2*12*22*32*...*2012
b.3*13*23*...*2013
c.4*14*24*...*2004
d.2*12*22*...*2020
Cac ban giai ro giup minh nha.Minh cam on

hay cho biet tich A=2*12*22*32*.....*2002*2012

co chu so tan cung la chu so may

khong thuc hien phep nhan hay nhan xet xem moi tich sau tan cung boi chu so nao ?

a, 1 2 3 4 5 6 7 8 9

b, 1 3 5 7 9 11

1)trong mot phepnhan co thua so thu hai la 64, khi thuc hien phep nhan, ban Minh da viet cac tich rieng thang cot voi nbhau nen ket qua tim duoc la 870. tim tich dung cua phep nhan

2 ) Khi thuc hien phep nhan 983 voi 1 so co 3 chu so , ban binh da dat tich rieng thu 2 thang cot voi tich rieng thu 3 nen duoc ket qua la 70776 . Em hay tim thua so co 3 chu so chua biet trong phep nhan tren , biet chu so hang tram hon chu so hang chuc 1 don vi

hay cho biet a=2*12*22*32*....*2002*2012

co chu so tan cung la cung so may...

khi thuc hien phep nhan 2 thua so, mot ban da viet nham 2 chu so cuoi cung cua thua so thu 1 la 35 thanh 53 nen co ket qua la 22197.tim 2 thua so da cho, biet rang tich dung cua chung la 21315

tich 2*12*22*......*92 co chu so tan cung la so nao

 khong thuc hien phep tinh hay cho biet chu so hang don vi cua moi ket qua sau

A, (2001+2002+2003+2004+..........+2007+2008+2009) - (21+32+43+54+......+98+119

)

B, (12+23+34+45+........+78+89+91) • 91•73•55•37•19

Chu y: ^•^ la nhan

Ai lam dung mk cho 2 tk viet ro CAU tra loi ko tom tat !!!