1m(a+b)=am+bm2m(a-b)=am-bm3.(x+y)²=x²+2xy+y²4.(x-y)²=x²-2xy+y²5.(x+y)(x-y)=x²-y²6.(x+a)(x+b)=x²+(a+b)x+ab7. (ax+b)(cx+d) = acx²+(ad+bc)x+bd등있습니다.
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