ชอ่ื .....................................สกลุ ...........................
ชนั้ ....................................เลขท่.ี .........................
( )xy (x + y)3 = (x + y) x2 − xy + y2 = I+
xyx + y y = 1,2,3,...
= 0,1,2,3 xyx + y = y
51
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เอกสารประกอบการสอนตรรกศาสตร์
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