• 7-Matem
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  • (b+2/3)〗^2=b^2+⋯+⋯
    4b/3. va.   4/9
  • (2+3a)^2=4+12a+⋯
    9a^2
  • (a-6)^2=⋯-…+36
    a^2.   va.    12a
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