Question

[nguyen chung]

1. tìm x ; y biết : ​ 3.x2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>x</strong>}}^{\mathrm{<strong>2</strong>}}$.y + 5. 2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>x</strong>}}^{\mathrm{<strong>2</strong>}}$2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml"> +2.x.2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">+3y22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>y</strong>}}^{\mathrm{<strong>2</strong>}}$ + 5.2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">y
   2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>y</strong>}}^{\mathrm{<strong>2</strong>}}$ = 16