题目内容
如图所示是一块正方形铁皮,边长为a,如果一边截去6,另一边截去5,则下面式子中正确地表示所剩长方形(阴影部分)铁皮的面积的有______.(填序号)
①(a-5)(a-6);
②a2-5a+6(a-5);
③a2-6a-5(a-6);
④a2-11a+30.
①(a-5)(a-6);
②a2-5a+6(a-5);
③a2-6a-5(a-6);
④a2-11a+30.
①(a-5)(a-6)=a2-11a+30,正确;
②a2-5a+6(a-5)=a2+a-30,错误;
③a2-6a-5(a-6)=a2-11a+30,正确;
④a2-11a+30,正确,
则正确地表示所剩长方形(阴影部分)铁皮的面积的有①③④.
故答案为:①③④.
②a2-5a+6(a-5)=a2+a-30,错误;
③a2-6a-5(a-6)=a2-11a+30,正确;
④a2-11a+30,正确,
则正确地表示所剩长方形(阴影部分)铁皮的面积的有①③④.
故答案为:①③④.
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