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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 一张长12分米,宽8分米的彩纸,要裁成20厘米,宽10厘米的小彩旗。(1)这张彩纸的面积是多少?( - www问答网