hay cho biet tich 1*2*3*4*5*6*7*8*9 tan cung la chu so may

hay cho biet tich 1*2*3*4*5*6*7*8*9co tan cung la chu so may

7^1+7^2+7^3+7^4+7^5+7^6+7^7+7^8 chu so tan cung la may

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

co chu so tan cung la chu so may

Cho biet A la tich 2008* 2008*2008*.........*2008( Co 2009 thua so 2008)

Hoi tich tren co tan cung la chu so may

bai 1;tinh gia tri bieu thuc 17a+15b+6a+8b voi a+b =100

bai 2;tich cua 2 so la 6210.neu giam 1 thua so di 7 don vi thi tich moi la 5265.tim cac thua so  cua tich

bai 3;co 5 so tu nhien nao ma tich cua chung bang1001 va chu so tan cung la 6

bai 4;tinh;333...3.999...9 trong do co 50 chu so 3 va 50 chu so 9

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

hay cho biet tich 4*14*24*34*...*74*84*94 ket qua co tan cung la chu so may ?

tổng của hai p/s ;là 7/6 p/s thứ 1 hơn p/s thứ 2 la1/3.

tim p/s thu 1

tich sau tan cung la chu so nao 1*2**4*5*6*7*8*.......100