(x＋3y)(3xーy)ー(3xーy)(xー3y)
分配法則の逆。
=[(x＋3y)ー(xー3y)](3xーy)
=6y(3xーy)
代入。
=6×4×(3×1/3-4)
=24×(ー3)
=ー72
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(x＋3y)(3xーy)ー(3xーy)(xー3y)
分配法則の逆。
=[(x＋3y)ー(xー3y)](3xーy)
=6y(3xーy)
代入。
=6×4×(3×1/3-4)
=24×(ー3)
=ー72
Users viewing this question
are also looking at these questions 😉
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