Question

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Answer 1

Ответ:

$(1.2x^2-0.3y)^2$

Объяснение:

$(a-b)^2=a^2-2ab+b^2\ \ \Rightarrow\ \ a^2-2ab+b^2=(a-b)^2$

$1.44x^4-0.72x^2y+0.09y^2$

$1.44x^4=\left(1.2x^2\right)^2$

$0.72x^2y=2\cdot1.2x^2\cdot0.3y$

$0.09y^2=(0.3y)^2$

$1.44x^4-0.72x^2y+0.09y^2=\left(1.2x^2\right)^2-2\cdot1.2x^2\cdot0.3y+(0.3y)^2=(1.2x^2-0.3y)^2$