Question

Tính: 99 - 97 + 95 - 93 + ..............................+3 - 1

Answer 1

ta có: 99-97+95-93+...+3-1

       =(99-97)+(95-93)+...+(3-1)       [có 25 cặp]

       =2+2+...+2

       =2*25

       =50

cho mk nha mk tr đầu tiên nà ^-^ <3<3<3<3

Answer 2

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