5a2b chia hết cho 5 thì b = 0; 5. Khi 5a2b chia 5 dư 1 thì b= 1; 6

Còn 5a2b chia hết cho 9 thì 5 + a + 2 + b = 7 + a + b chia hết cho 9

Nếu: b = 1 => 7 + a + 1 = 9 => a = 1 nên số cần tìm là 5121

Nếu: b = 6 => 7 + a + 6 = 18 => a = 5 nên số cần tìm là 5526

sory mới lớp 5

a*1+a*3+a*6=2500

a*(1+3+6)=2500

a*10=2500

a=2500:10

a=250

tích đúng là:

250*136=34000

   Đ/S:34000

I think , in my town has a lot of trajjic problems.Firsly,there are too many people and vehicles using the road.Secondly,the road is too narrow and bumpy.Thirdly,people don't obey the rules so trajjic accidents happen every day.Finally,the young people riding their bikes and motorbike too carelessly.There fore,we should obey the laws to avoid traffic accidents.

I think , in my town has a lot of trajjic problems.Firsly,there are too many people and vehicles using the road.Secondly,the road is too narrow and bumpy.Thirdly,people don't obey the rules so trajjic accidents happen every day.Finally,the young people riding their bikes and motorbike too carelessly.There fore,we should obey the laws to avoid traffic accidents.

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