104,8248635

c, 50 - 1 . ( -40 - 10 )

= 50 - 1 . -50

= 50 + 50

= 100 

a, 25 - 34 - 25 + (-45) + 34 

= ( 25 - 25 ) - (-34 + 34) + -45

= -45 

265(tich nhe)

a: 50/18,5=270,27%

b: 34/36=94,44%

c: 124:34=364,71%

d: 8/12=66,66%

\(\frac{121212}{151515}+\frac{121212}{353535}+\frac{121212}{636363}+\frac{121212}{999999}\)

= \(\frac{12.10101}{15.10101}+\frac{12.10101}{35.10101}+\frac{12.10101}{63.10101}+\frac{12.10101}{99.10101}\)

= \(\frac{12}{15}+\frac{12}{35}+\frac{12}{63}+\frac{12}{99}\)

= \(\frac{12}{3.5}+\frac{12}{5.7}+\frac{12}{7.9}+\frac{12}{9.11}\)

= \(6.\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\right)\)

= \(6.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right)\)

= \(6.\left(\frac{1}{3}-\frac{1}{11}\right)\)

= \(6.\frac{8}{33}\)

= \(\frac{16}{11}\)

=\(70\left(\frac{121212}{565656}+\frac{121212}{727272}+\frac{121212}{909090}\right)\)

=\(70\left(\frac{3.40404}{14.40404}+\frac{121212}{6.121212}+\frac{2.60606}{15.60606}\right)\)

=\(70\left(\frac{3}{14}+\frac{1}{6}+\frac{2}{15}\right)\)

=\(70.\frac{18}{35}=38\)

17/25*1128+34/50*17/28=187/700+289/700=17/25

=17/25*(11/28+17/28)

=17/25*1

=17/25

17/25 x 11/28 + 34/50 x 17/28 = 17/25

k mk nha mk k lai

121212x121212=14692348944

k mình nha !

121212 x 121212 = 14692348944

14692348944