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

Toán Lớp 8: Tính nhanh: a) 34 ² + 66 ² + 68.66 b) 74 ² + 24 ² – 48.74

Toán Lớp 8: Tính nhanh:

a) 34 ² + 66 ² + 68.66
b) 74 ² + 24 ² – 48.74

Comments ( 2 )

  1. a/
    34^2 +66^2 + 68 . 66
    = 34^2 + 2 . 34 . 66 +66^2
    = (34+66)^2
    = 100^2
    = 10000
    b/
    74^2 +24^2 – 48 . 74
    = 74^2 – 2 . 24 . 74 +24^2
    = (74-24)^2
    = 50^2
    = 2500 

  2. #Sad
    a)34^2+66^2+88.66
    =34^2+2.34.66+66^2
    =(34+66)^2
    =100^2
    =10000
    b)74^2+24^2-48.74
    =74^2-2.24.74+24^2
    =(74-24)^2
    =50^2
    =25000
     

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

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