a:1:{i:0;a:13:{s:2:"id";s:3:"601";s:7:"answer1";s:205:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B%5Csqrt%7Bx_0%7D-%5Csqrt%7Bh%7D%7D%7Bh%7D" alt="\frac{\sqrt{x_0}-\sqrt{h}}{h}" /></p>";s:7:"answer2";s:207:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B%5Csqrt%7Bx_0%7D%2B%5Csqrt%7Bh%7D%7D%7Bh%7D" alt="\frac{\sqrt{x_0}+\sqrt{h}}{h}" /></p>";s:7:"answer3";s:215:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B%5Csqrt%7Bx_0%2Bh%7D-%5Csqrt%7Bx_0%7D%7D%7Bh%7D" alt="\frac{\sqrt{x_0+h}-\sqrt{x_0}}{h}" /></p>";s:7:"answer4";s:213:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B%5Csqrt%7Bx_0%2Bh%7D%2B%5Csqrt%7Bh%7D%7D%7Bh%7D" alt="\frac{\sqrt{x_0+h}+\sqrt{h}}{h}" /></p>";s:7:"answer5";s:0:"";s:7:"answer6";s:0:"";s:7:"answer7";s:0:"";s:7:"answer8";s:0:"";s:7:"answer9";s:0:"";s:8:"answer10";s:0:"";s:4:"good";s:10:"0010000000";s:8:"question";s:4:"1861";}}