Hướng dẫn giải Hoạt động 4 (Trang 73 SGK Toán Hình học 12)

Đề bài Nếu <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi><mo>=</mo><mn>0</mn></math> hoặc <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><mo>=</mo><mn>0</mn></math> thì mặt phẳng <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mi>α</mi></mfenced></math> có đặc điểm gì ? Lời giải chi tiết <span id="MathJax-Element-4-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi><mo>=</mo><mn>0</mn><mrow class="MJX-TeXAtom-ORD"><mrow class="MJX-TeXAtom-ORD"></mrow></mrow><mo stretchy="false">&#x21D2;</mo></math>"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi><mo>=</mo><mn>0</mn></math>⇒</mo></math> mặt phẳng <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mi>α</mi></mfenced><mo>∥</mo></math> hoặc chứa trục <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>O</mi><mi>y</mi><mo>;</mo></math> <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><mo>=</mo><mn>0</mn></math> <span id="MathJax-Element-6-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>O</mi><mi>y</mi><mo>;</mo><mspace width="thinmathspace" /><mi>C</mi><mo>=</mo><mn>0</mn><mo stretchy="false">&#x21D2;</mo></math>"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math> mặt phẳng <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mi>α</mi></mfenced><mo>∥</mo></math> hoặc chứa trục <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>O</mi><mi>z</mi></math>

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