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

Toán Lớp 6: a) 84 : 4 + 39 : 37 + 50 b) (519 : 517 + 3) : 7 c) 295 – (31 – 22.5)2 d) 6

Toán Lớp 6: a) 84 : 4 + 39 : 37 + 50 b) (519 : 517 + 3) : 7 c) 295 – (31 – 22.5)2 d) 62 : 9 + 50.2 – 33.3 e) 29 – [16 + 3.(51 – 49)] f) 47 – [(45.24 – 52.12):14] g) 50–[(20–23):2+34] h) – 23 + 289 + 123 – 689

Comments ( 2 )

  1. Giải đáp:

     

    Lời giải và giải thích chi tiết:

    a)$84 : 4 + 39 : 37 + 50$

    $=21+ \dfrac{39}{37}+50$

    $=71 +\dfrac{39}{37}$

    $=\dfrac{266}{37}$

    b) (519 : 517 + 3) : 7 

    $=(\dfrac{519}{517} + 3) : 7$

    $=\dfrac{2070}{517} : 7$

    $=\dfrac{2070}{3619}$

    c)$295 – (31 – 2^2.5)^2$

    $=295 – (31 – 4.5)^2$

    $=295-11^2$

    $=174$

    d) $62 : 9 + 50.2 – 33.3$

    $= 6,9 + 100 – 99$

    $= 7,9$

    e)$29 – [16 + 3.(51 – 49)]$

    $=29-[16+3.2]$

    $=29-[16+6]$

    $=29-22$

    $=7$

    f)47 – $[(45.2^4 – 5^2.12):14]$

    $=47 – [(45.16 – 25.12):14]$

    $=47-(420:14)$

    $=47-30$

    $=17$

    g) $50–[(20–23):2+34]$

    $= 50 – 32,5$

    $= 17,5$

    h) $– 23 + 289 + 123 – 689$

    $=266 -566$

    $=-300$

    Xin ctlhn

  2. Lời giải và giải thích chi tiết:

    a) 84 : 4 + 39 : 37 + 50

    = 21 + 1,1 +50 

    = 21,1 + 50 

    = 71,1

    b) ( 519 : 517 + 3 ) : 7

    = 4,1 : 7

    = 0,1 

    c) 295 – ( 31 – 22.5 ). 2

    = 295 + 79 .2 

    = 295 + 158

    = 453

    d) 62 : 9 + 50.2 – 33.3

    = 6,9 + 100 – 99

    = 7,9 

    h) – 23 + 289 + 123 – 689

    =  266 -566

    = -300

    g) 50–[(20–23):2+34]

    = 50 – 32,5

    = 17,5

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