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

Toán Lớp 6: 2 bỏ dấu ngoặc a) -47-(-47+81) b) 28+(69-28) c) -91-(87-91) d) -87+(-96+87) e) -(-37)+81+37

Toán Lớp 6: 2 bỏ dấu ngoặc
a) -47-(-47+81)
b) 28+(69-28)
c) -91-(87-91)
d) -87+(-96+87)
e) -(-37)+81+37

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a) -47-(-47+81)
    =-47-(-47)-81
    =0-81
    =81
    b) 28+(69-28)
    =28+69-28
    =28-28+69
    =0+69
    =69
    c) -91-(87-91)
    =-91-87+91
    =-178+91
    =-87
    d) -87+(-96+87)
    =-87+(-96)+87
    =-87+87+(-96)
    =0+(-96)
    =-96
    e) -(-37)+81+37
    =37+81+37
    =118+37
    =155

  2. ${a) -47 – ( -47 + 81 )}$
    ${= -47 + 47 + 81}$
    ${= 81}$
    ${b) 28 + ( 69 – 28 )}$
    ${= 28 + 69 – 28}$
    ${= 69}$
    ${c) -91 – ( 87 – 91 )}$
    ${= -91 – 87 + 91}$
    ${= -87}$
    ${d) -87 + ( -96 + 87 )}$
    ${= -87 – 96 + 87}$
    ${= -96}$
    ${e) -( -37 ) + 81 + 37}$
    ${= 37 + 81 + 37}$
    ${= 155}$
     

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

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