1.tính hợp lý:
-1999.19981998 + 19991999.1998
2.tìm x
A) -1-2(-3+2|a+b|≤|a|+|b||" role="presentation" style="border:0px; direction:ltr; display:inline-table; font-size:21.06px; font-weight:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">|x|a+b|≤|a|+|b||" role="presentation" style="border:0px; direction:ltr; display:inline-table; font-size:21.06px; font-weight:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">|)=-7
|a+b|≤|a|+|b||" role="presentation" style="border:0px; direction:ltr; display:inline-table; font-size:21.06px; font-weight:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">(13.3^x-2 - 3^x):2=162(với x>2)
Nhanh nhé mk tick
|a+b|≤|a|+|b||" role="presentation" style="border:0px; direction:ltr; display:inline-table; font-size:21.06px; font-weight:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">|a+b|≤|a|+|b||" role="presentation" style="border:0px; direction:ltr; display:inline-table; font-size:21.06px; font-weight:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">
