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

Toán Lớp 6: c)20 21.(-84)+2021.(-16) d)60:| 19-(7-3) mũ 2| câu 2 a)24-x=19 b)(21+x)-8=14

Toán Lớp 6: c)20
21.(-84)+2021.(-16)
d)60:| 19-(7-3) mũ 2|
câu 2
a)24-x=19
b)(21+x)-8=14

Comments ( 2 )

  1. $ a) 2021 . ( -84 ) + 2021 . ( -16 ) = 2021 . [ ( -84 ) + ( -16 ) ] = 2021 . ( -100 ) = ( -202100 ) $

    $ b) 60 : | 19 – ( 7 – 3 )^2 | = 60 : | 19 – 4^2 | = 60 : | 19 – 16 | = 60 : 3 = 20 $

    $ c) 24 – x = 19 ⇒ x = 24-19=5 $

    $ d) ( 21 + x ) – 8 =14 ⇒ 21+x-8 = 14 ⇒ 13+x=14 ⇒ x=14-13=1 $

     

  2. Lời giải và giải thích chi tiết:

    c)2021.(-84)+2021.(-16)

    = 2021. -(84+16)

    = 2021. -100

    = -202100

    d)60:| 19-(7-3) ²|

    =60: [19-4²]

    =60: [19-16]

    =60:3

    =30

    câu 2

    a)24-x=19

    x = 24-19

    x =5

    b)(21+x)-8=14

    21+x =14+8

    21 + x =22

    x =22-21

    x =1

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

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