Toán Lớp 8: Rút gọn (2x+y)^2 + 4x^2 - 4x(2x+y)

(2x+y)^2+4x^2-4x(2x+y) =(2x)^2+2.2x.y+y^2+4x^2-8x^2-4xy =4x^2+4xy+y^2+4x^2-8x^2-4xy =y^2

(2x+y)^2+4x^2-4x(2x+y) =(2x)^2+2.2x.y+y^2+4x^2-4x.2x-4x.y =4x^2+4xy+y^2+4x^2-8x^2-4xy =(4x^2+4x^2-8x^2)+(4xy-4xy)+y^2 =y^2

Toán Lớp 8: Rút gọn `(2x+y)^2 + 4x^2

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