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\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)
\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)\(\frac{5}{9}\)
dấu chấm bạn cứ hiểu là nhân nhé !
\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5+11x5+111x5+1111x5}{9+11x9+111x9+1111x9}\)\(=\frac{5x5x5x5}{9x9x9x9}=\frac{625}{6561}\)
\(A=\frac{8\cdot4\cdot125\cdot25+96524+2476}{10\cdot125\cdot4\cdot25\cdot8}\)
\(A=\frac{1+96524+2476}{10}\)
\(A=\frac{99001}{10}\)
\(B=\frac{5+55+555+5555}{9+99+999+9999}\)
\(B=\frac{9}{5}\)
\(A=\left(10^2-1\right)+\left(10^3-1\right)+...+\left(10^{51}-1\right)\)
\(=-50+\left(10^2+10^3+...+10^{51}\right)\)
\(=-50+\frac{10^{52}-10^2}{10-1}=\frac{10^{52}-10^2}{9}-50\)
999 + 3 + 98 + 998 + 3 + 9
= ( 999 + 1 ) + ( 98 + 2 ) + ( 998 + 2 ) + ( 99 + 1 ) + ( 9 + 1 )
= 1000 + 100 + 1000 + 100 + 10
= 2110
636 - 576 - 99 + 367
= ( 636 + 364 ) + 3 - ( 575 + 100 )
= 900 - ( 675 - 3 )
= 228
5034 - 997 - 998 - 999
= 5034 + 6 - ( 1000 + 1000 + 1000 )
= 5040 - 3000
= 2040
Mỏi tay quá k giúp mình nhé !!!!!!
\(\frac{5+55+555+5555}{9+99+999+9999}=\)
\(=\frac{5x\left(1+11+111+1111\right)}{9x\left(1+11+111+1111\right)}=\frac{5}{9}\)