The teacher asked Ben a difficult question in class.
A:answer
B:answering
C:to answer
D:answered
(Ⅰ)求A;
(Ⅱ)若a= 7 ,△ABC的面积为 332 ,求△ABC的周长.
求未知数x。
① 23 x+3.35=11.35
②7.2:x= 89
③ 524 :x= 15:16
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