Toán Lớp 8: phâ tích thanh nhân tử 5x^2-5y^2-4x+4y
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Toán Lớp 8: phâ tích thanh nhân tử 5x^2-5y^2-4x+4y
Comments ( 2 )
=5.(x^2-y^2)-(4x-4y)
=5.(x-y)(x+y)-4.(x-y)
=(x-y).[(5.(x+y)-4]
=(x-y).(5x+5y-4)