Toán Lớp 7: cho A = 8.x^5.y^3, B= -2x^6 y^3, C=-6x^7 y^3 chứng minh rằng Ax^2 + Bx +C=0
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Toán Lớp 7: cho A = 8.x^5.y^3, B= -2x^6 y^3, C=-6x^7 y^3 chứng minh rằng Ax^2 + Bx +C=0
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Ax^2+Bx+C=8x^5y^3x^2+(-2x^6y^3.x)+(-6.x^7.y^3).
=8x^7y^3-2x^7y^3-6x^7y^3=0