Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: 3/4*9 + 3/9*14 + 3/14* 19 +…+ 3/34*39

Home/ Toán Lớp 5: 3/4*9 + 3/9*14 + 3/14* 19 +…+ 3/34*39

Toán Lớp 5: 3/4*9 + 3/9*14 + 3/14* 19 +…+ 3/34*39

Tháng Sáu 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: 3/4*9 + 3/9*14 + 3/14* 19 +…+ 3/34*39

Comments ( 2 )

  1. ngochuong2k2
    ngochuong2k2
    2 Tháng Sáu, 2022 at 7:06 sáng
    Reply
    Answer
    3/{4xx9} + 3/{9xx14} + … + 3/{34xx39}
    = 5/5 . (3/{4xx9} + 3/{9xx14} + … + 3/{34xx39})
    = 3/5 . (5/{4xx9} + 5/{9xx14} + … + 5/{34xx39})
    = 3/5 . (1/4 – 1/9 + 1/9 – 1/14 + … + 1/34 – 1/39)
    = 3/5 . (1/4 – 1/39)
    = 3/5 . 35/156
    = 7/52

  2. ngoclankhue
    ngoclankhue
    2 Tháng Sáu, 2022 at 7:06 sáng
    Reply
    3/( 4 xx 9) + 3/(9 xx 14) + 3/( 14 xx 19) + … + 3/( 34 xx 39)
    = 3/5 xx ( 5/( 4 xx 9) + 5/(9 xx 14) + 5/( 14 xx 19) + …. + 5/( 34 xx 39))
    = 3/5 xx ( 1/4 – 1/9 + 1/9 – 1/14 + 1/14 – 1/19 + …. + 1/34 – 1/39)
    = 3/5 xx ( 1/4 – 1/39)
    = 3/5 xx 35/ 156
    = 7/52
    #caty09

Leave a reply

222-9+11+12:2*14+14 = ? ( )

Trang

About Trang