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

Toán Lớp 6: a) 21 x 16 + 21 x 59 + 21 x 25 b) 80 – ( 4 x 5^2 – 3 x 2^3 ) = 2020^0 c) ( -12 ) + 87 + ( – 48 ) + 13 d) ( -27 + 21 ) – ( -27 + 15 + 21

Toán Lớp 6: a) 21 x 16 + 21 x 59 + 21 x 25
b) 80 – ( 4 x 5^2 – 3 x 2^3 ) = 2020^0
c) ( -12 ) + 87 + ( – 48 ) + 13
d) ( -27 + 21 ) – ( -27 + 15 + 21 )
e) 18 : 3^2 + 5 x 2^3
f) 400 : {5 x [ 360 – ( 290 + 2 x 5^2 )]}

Comments ( 2 )

  1. a) 21*16 + 21 *59 + 21 *25
    = 21(16 + 25 + 59 * 1 )
    = 21 *100 
    =2100
    ( -12 ) + 87 + ( – 48 ) + 13
    [(-12) + ( -48)] + (13 + 87 )
    = -60 + 100
    = 40
    ( -27 + 21 ) – ( -27 + 15 + 21 )
    =-27 + 21 – (-27) – 15 – 21
    =[(-27) +27)] – (21 – 21 ) – 15
    = 0 – 0 – 15
    =-15  
    18 : 9 + 5 * 8 .
    =2 + 40
    =42 
    Mình chỉ biết làm acde thui thông cảm nha

  2. a) 21*16 + 21 *59 + 21 *25
    = 21(16 + 25 + 59 * 1 )
    = 21 *100 
    =2100
    80 – ( 4 * 5^2 – 3 * 2^3 ) – 2020^0
    =80 – ( 4*25-3*8) -1
    =80 – 76 -1
    =3
    ( -12 ) + 87 + ( – 48 ) + 13
    [(-12) + ( -48)] + (13 + 87 )
    = -60 + 100
    = 40
    ( -27 + 21 ) – ( -27 + 15 + 21 )
    =-27 + 21 – (-27) – 15 – 21
    =[(-27) +27)] – (21 – 21 ) – 15
    = 0 – 0 – 15
    =-15  
    18 : 9 + 5 * 8 .
    =2 + 40
    =42 
    400 : {5 * [ 360 – ( 290 + 2 * 5^2 )]}
    = 400 : { 5 *[360 -(290+2*25)
    =400 : {5*[360 – 340]}
    =400 : {5*20}
    =400 : 100
    =4 

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