Toán Lớp 8: (x-1/2y).(x+1/2y)
(xy^2+1).(1-xy^2)
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Toán Lớp 8: (x-1/2y).(x+1/2y)
(xy^2+1).(1-xy^2)
Comments ( 2 )
=x^2-(1/2y)^2 (hằng đẳng thức số 3 x^2-y^2=(x+y)(x-y))
=x^2-1/4y^2
(xy^2+1).(1-xy^2)
=1^2-(xy^2)^2 (hằng đẳng thức số 3)
=1-x^2y^4