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1.4: Десяткове позначення
https://ukrayinska.libretexts.org/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0/%D0%9A%D0%BD%D0%B8%D0%B3%D0%B0%3A_%D0%95%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%D0%B0%D1%80%D0%BD%D0%B0_%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0_(Arnold)/01%3A_%D0%90%D1%80%D0%B8%D1%84%D0%BC%D0%B5%D1%82%D0%B8%D0%BA%D0%B0_%D1%87%D0%B8%D1%81%D0%B5%D0%BB/1.04%3A_%D0%94%D0%B5%D1%81%D1%8F%D1%82%D0%BA%D0%BE%D0%B2%D0%B5_%D0%BF%D0%BE%D0%B7%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%BD%D1%8F
\[\begin{aligned} 1.2 x^{2}-3.4 x &=1.2(\quad)^{2}-3.4(\quad) \quad \color{Red} \text { Replace } x \text { with parentheses. } \\ &=1.2(-0.3)^{2}-3.4(-0.3) \quad \color{Red} \text { Substitute }-0.3 ...\[\begin{aligned} 1.2 x^{2}-3.4 x &=1.2(\quad)^{2}-3.4(\quad) \quad \color{Red} \text { Replace } x \text { with parentheses. } \\ &=1.2(-0.3)^{2}-3.4(-0.3) \quad \color{Red} \text { Substitute }-0.3 \text { for } x . \\ &=1.2(0.09)-3.4(-0.3) \quad \color{Red} \text { Exponent: }(-0.3)^{2}=0.09 \\ &=0.108-(-1.02) \quad \color{Red} \text { Multiply: } 1.2(0.09)=0.108 \text { and } \\ &=0.108+1.02 \quad \color{Red} \text { Add the opposite. } \\ &=1.128 \quad \color{Red} \text { Simplify. } \end{…