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        <h1>人教版●四年级数学（上册）</h1>
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        <h2>
            单元全练全测 - 第二、三单元全练全测
        </h2>
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            <div class="answerBox">
	<h4>
		第一题</h4>
	<p>
		1．没有　无限　1　2　长度</p>
	<p>
		2．量角器　度</p>
	<p>
		<span style="color:#ff0000;">【<strong>※浙江专用</strong>】</span><span style="line-height: 2em; text-indent: 2em;">2．平&nbsp; 直&nbsp; 周</span></p>
	<p>
		3．90　30</p>
	<p>
		4．4　600　80</p>
	<p>
		5．2　12　6</p>
</div>
<div class="answerBox">
	<h4>
		第二题</h4>
	<p>
		④⑩　②⑨　①⑧<span style="font-size:18px;">⑫</span></p>
</div>
<div class="answerBox">
	<h4>
		第三题</h4>
	<p>
		<img alt="" src="/_Upload/CKFiles/images/20160604085610001.png" style="width: 104px; height: 81px;" /></p>
</div>
<div class="answerBox">
	<h4>
		第四题</h4>
	<p>
		1．&times;　2．&radic;　3．&times;　4．&times;　5．&radic;</p>
</div>
<div class="answerBox">
	<h4>
		第五题</h4>
	<p>
		1．C　2．A　</p>
	<p>
		3．<strong><span style="color:#ff0000;">分析：</span></strong>通过观察，图中的30&deg;角、直角（90&deg;）和&ang;1组成了一个平角，平角是180&deg;，由此推出：30&deg;+90&deg;+&ang;1＝180&deg;，所以&ang;1＝60&deg;。<img alt="" src="/_Upload/CKFiles/images/20150507105040733.jpg" style="width: 108px; height: 76px;" /></p>
	<p>
		<strong><span style="color:#ff0000;">解答：</span></strong>B&hellip;&hellip;&hellip;&hellip;（3分）</p>
	<p>
		4．<strong><span style="color:#ff0000;">分析：</span></strong>由图可知，把平角分成两个角，其中一个角是钝角，要判断另一个角。因为平角是180&deg;的角，钝角是大于90&deg;而小于180&deg;的角，所以平角的度数减去钝角的度数得到的角的度数一定小于90&deg;，而小于90&deg;的角是锐角。（在判断时也可用具体数证明）</p>
	<p>
		<span style="color:#ff0000;"><strong>解答：</strong></span>B&hellip;&hellip;&hellip;&hellip;（3分）</p>
</div>
<div class="answerBox">
	<h4>
		第七题</h4>
	<p>
		④＜③＜②＜①＜⑤</p>
</div>
<div class="answerBox">
	<h4>
		第九题</h4>
	<p>
		1．60&deg;</p>
	<p>
		2．60&deg;</p>
	<p>
		3．<strong><span style="color:#ff0000;">分析：</span></strong><span style="font-size:16px;">可设&ang;1和&ang;2中间的角为&ang;3，如图，通过观察发现：</span></p>
	<p>
		<span style="font-size:16px;"><img alt="" src="/_Upload/CKFiles/images/20160604085803970.png" style="width: 132px; height: 141px;" /></span></p>
	<p>
		&ang;1+&ang;3＝180&deg;，又知&ang;1＝60&deg;，由此推出&ang;3＝120&deg;。</p>
	<p>
		&ang;2+&ang;3＝180&deg;，由此推出&ang;2＝60&deg;。</p>
	<p>
		<strong><span style="color:#ff0000;">解答：</span></strong><span style="font-size: 14px;">&nbsp;<span style="font-size:16px;">60&deg;&hellip;&hellip;&hellip;&hellip;（9分）</span></span></p>
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        <p>小学教材全练</p>
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