1.2.3....9-1.2.3....8-1.2.3....7.8.8
= 1.2.2...9-1.2.3....8-1.2.3....7.8^2
= 8! . 9 . 8! .1 - 8! .8
= 8!.( 9-1-8)
= 8! . 0
= 0
tk mik nếu đúng nha ~!
Bài 1 Tính nhanh
1.2.3...9-1.2.3...8-1.2.3...7.8.8
1152-(374+1152)+(-65+374)
13-12+11+10-9+8-7-6+5-4+3+2-1
B=1.2.3+4.5.6+7.8.8+...+100.101.102
1.2.3...9-1.2.3...8-1.2.3...7.82
1.2.3...9-1.2.3...8-1.2.3...8^2
Giải thích giùm mình nha
tính nhanh 1.2.3....9 - 1.2.3....8 - 1.2.3......8^2
b) 1.2.3...9-1.2.3...8-1.2.3...7.8^ 2
A = 1.2.3....9 - 1.2.3...8 - 1.2.3.....8.8
1.2.3......9-1.2.3....8-1.2.3.....8.8 mng giúp với ạ
tính: 1.2.3.....9-1.2.3.....8-1.2.3.....82
