A:to try; to hel
B:try; hel
C:try; helping
D:try; to hel
①两个钝角相等;
②等式两边加上同一个数或同一个整式,所得的结果仍是等式;
③今天天气很晴朗啊;
④三角形的内角和是180°.
①a2﹣2ab+b2=(a﹣b)2;
②a2﹣b2=(a+b)(a﹣b);
③a2+ab=a(a+b).
____: 25 = 25 ; 59 ×9÷ 59 ×9=____;
1.75× 625 +0.76÷ 47 =____; 2520﹣36×42÷27____.
如图,一块直角三角板ABC的斜边AB与量角器的直径重合,点D对应54°,则∠BCD的度数为( )