toán khó nè anh em ơi!!!:khi (131):

L

luuhuuhai

To biet roi Huy a;););)
111..12...22=11...10...00+22...2=11..1x100...0+11...1x2=111...1x(100...0+2)=11...1x(999....99+1+2)=11...1x(33....3x3+3)=111...1x3x(33....3+1)=333...33x33..34(dpcm)
 
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