hoa mắt quá, mk đang tính

kết quả = 1/13 đúng ko bn, k mk nha ( nếu đúng )

\(\frac{121212}{424242}=\frac{121212:10101}{424242:10101}=\frac{12}{42}=\frac{2}{7}\)

\(\frac{1999999999}{9999999995}=\frac{1999999999:1999999999}{9999999995:1999999999}=\frac{1}{5}\)

121212 / 424242 = 2/7

1999999999 / 9999999995 = 1/5

\(\frac{121212}{424242}\)

= \(\frac{12.10101}{42.10101}\)

rút gọn

= \(1\)

\(\frac{121212}{424242}=\frac{121212:60606}{424242:60606}=\frac{2}{7}\)

Ta có : \(\frac{121212}{424242}\)= \(\frac{121212:60606}{424242:60606}\)= \(\frac{2}{7}\).

ta có \(\frac{121212}{424242}=\frac{121212:60606}{424242:60606}=\frac{2}{7}\)

121212/424242=2/7 vì đề chia cho 60606

lay ca tu va mau chia 10101 thi ta dc 12/42 . Sau do ta se rut gon don gian hon

vi ca tu va mau cung chia het cho 6 nen chia ca tu va mau cho 6 thi ta dc 2/7 

Vay ds la 2/7

Đặt 

\(A=210.\left(\frac{111111}{121212}+\frac{111111}{202020}+\frac{111111}{303030}+\frac{111111}{424242}+\frac{111111}{565656}+\frac{111111}{727272}+\frac{111111}{909090}\right)\)

     \(=210.\left(\frac{11}{12}+\frac{11}{20}+\frac{11}{30}+\frac{11}{42}+\frac{11}{56}+\frac{11}{72}+\frac{11}{90}\right)\)

    \(=210.11\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)

     \(=2310.\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)

    \(=2310.\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)

     \(=2310.\left(\frac{1}{3}-\frac{1}{10}\right)\)

       \(=2310.\frac{7}{30}\)

        \(=539\)

210.(111111/121212 +111111/202020+11111/303030 + 111111/424242 +111111/565656 +111111/727272 +111111/909090)

= 210 . ( 11/12+11/20+11/42+11/56+11/72+11/90)

= 210.(11.(1/12+1/20+1/42+1/56+1/72+1/90))

=210.(11(1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10))

=210.(11.(1/3-1/10))

=210.(11.7/30)

=210.77/30

=593

 T I C K    GIÙM MIK

121212/42424 = 2/7

187187187/22122122111 = 11/13

3.7,13,37,39-10101/505050+70707 = chó nào mà giải dc

chính cậu ko giải dc nữa còn đố

nếu mjnk trả loi dc thjj sao

\(\left(\frac{151515}{60606}+\frac{151515}{121212}+\frac{151515}{202020}+\frac{151515}{303030}+\frac{151515}{424242}\right)\times\frac{28}{15}\)

\(=\left(\frac{5}{2}+\frac{5}{4}+\frac{3}{4}+\frac{1}{2}+\frac{5}{14}\right)\times\frac{28}{15}\)

\(=\frac{75}{14}\times\frac{28}{15}\)

\(=10\)

= ( 1/4 + 5/4 + 3/4 + 1/2 + 5/14) . 28/15
= [ 9/4 +( 7/14 + 5/14)] . 28/15
=        (9/4 + 6/7) . 28/15
= 87/28 . 28/15 = 87/15 = 29/5
 

= 10,ai k mk thì mk k lại

a.12/42

b.2.000000001

a)121212/424242=12/42=2/7

b)19999999999/99999999995=1/5

\(a,\)\(\frac{121212}{424242}\)\(=\)\(\frac{121212:60606}{424242:60606}\)\(=\)\(\frac{2}{7}\)

\(b,\)\(\frac{19999999999}{99999999995}\)\(=\)\(\frac{19999999999:19999999999}{99999999995:19999999999}\)\(=\)\(\frac{1}{5}\)

k cho mình nha chúc bạn học tốt

ai k cho mình mình k lai