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

Toán Lớp 6: tìm x biết ( 24/168 +24/420 +24/780+..+ 24/880 ).x = 4/3

Tháng Một 18, 2023 Toán học 1 Comment 0 views

Toán Lớp 6: tìm x biết ( 24/168 +24/420 +24/780+..+ 24/880 ).x = 4/3

Comments ( 1 )

  1. phuongthuydung
    phuongthuydung
    18 Tháng Một, 2023 at 4:47 sáng
    Reply
    (24/168 + 24/420 + 24/780+…+24/8880) .x = 4/3
    => 4( 6/168 + 6/420 + 5/780 +…+ 6/8880) . x =4/3
    => 4x( 1/28 + 1/70 + 1/130+…+ 1/1480) = 4/3
    =>4x ( 1/4.7 + 1/7.10+ 1/10.13 +…+ 1/38.40) = 4/3
    =>4x . 1/3 ( 1/4 – 1/7 + 1/7- 1/10+…+1/38 – 1/40) = 4/3
    => 4x .1/3( 1/4 – 1/40) = 4/3
    => 4x . 1/3. 9/40 = 4/3
    => 3/10 x = 4/3
    => x= 4/3 : 3/10
    => x = 4/3 . 10/3
    => x=40/9
    Vậy x= 40/9
     

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

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