99.99+99

=99.99+99.1

=99.(99+1)

=99.100

=9900

Tui cx đồng ý vs bn đó!! Tức ghê

Có 7 số 9

cám ơn nha

2,tong gap so be 4 lan suy ra tong =4phan,so be ung voi 1phan(ve so do)

so lon ung voi so phan la:

4-1=3(phan)

vay so lon gap 3lanso be.

(tiep tuc ve so do hieu ti)

hieu ung voi so phan la:

3-1=2(phan)

so be la:

126:2x1=62

so lon la;

62+126=168

dap so :so lon 168.so be62

999+999+999+999+99999999999999999999999999:0 thuộc rỗng vì 99999999999999999999999999 không chia được cho 0

ab=6.a.b

10a+b=6.a.b

10a=b(6a-1)

b=10a/(6a-1)=a+(4a+1)/(6a-1)

a= 1 duy nhat b nguyen khi a>1 thi (4a+1)<(6a-1)

a=1=> b=2

ab=12