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利用因式分解计算进行简便计算:
(1).535²-465²(2).(312²-123²)/(543²-345²)
人气:184 ℃ 时间:2020-02-03 02:44:36
解答
1).535²-465²=(535+465)(535-465)=1000*70=70000
2).(321²-123²)/(543²-345²)=(321+123)(321-123)/[(543-345)(543+345)]
=444*198/(198*888)=1/2Are you sure?your question is wrongWhy?Where?321, not 312oh,sorry,thanks~
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