Làm :
987=102.9+10.8+100.7
2564 = 103.2+102.5+10.6+100.4
abcde = 104.a+103.b+102.c+10.d+100.e
987 = 9.100+8.10+7.1 2564 = 2.1000+5.100+6.10+4.1 abcde = a.10000+b.1000+c.100+d.10+e.1
= 9.10^2+8.10^1+7.10^0 = 2.10^3+5.10^2+6.10^1+4.10^0 = a.10^4+b.10^3+c.10^2+d.10^1+e.10^0
987=9.102+8.101+7.100
2564=2.103+5.102+6.101+4.100
abcde=a.104+b.103+c.102+d.101+e.100
987=9.100+8.10+7=9.102+8.101+7.100
2564=2.1000+5.100+6.10+4=2.103+5.102+6.101+4.100
abcde=a.10000+b.1000+c.100+d.10+e=a.104+b.103+c.102+d.101+e.100
987 = 9 . 102 + 8 . 10 + 7
2564 = 2 . 103 + 5 . 102 + 6 . 10 + 4
abcde = a . 104 + b . 103 + c . 102 + d . 10 + e
tk mk nha :3