1.若x=156,y=144,amp;frac12;xamp;sup2;;+xy+amp;frac12;yamp;sup2;等于?2.25（a+b)amp;sup2;-16(a-b)amp;sup2;等于?
<p>问题：1.若x=156,y=144,amp;frac12;xamp;sup2;;+xy+amp;frac12;yamp;sup2;等于?2.25（a+b)amp;sup2;-16(a-b)amp;sup2;等于?<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">姜自霞的回答：<div class="content-b">网友采纳 ,½x²;+xy+½y²=½(x²+2xy+y²)=½(x+y)²=½×300²=45000原式=²-²=(1.5a+1.5b)²-(4a-4b)²=[(1.5a+1.5b)+(4a-4b...
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