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

Toán Lớp 8: Tính nhanh a, 81^2 b, 97*103

Toán Lớp 8: Tính nhanh
a, 81^2 b, 97*103

Comments ( 2 )

  1. a) 81^{2}
    = (80+1)^{2}
    =80^{2}+2.80.1+1
    =6400+160+1
    =6561
    b)97.103
    =(100-3)(100+3)
    =100^{ 2}-3^{2}
    =10000-9
    =9991     

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

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