如题所述
简使运算49X51是把49变成50-1,51变成50+1,这样原式变成(50-1)×(50+1)=2500-1=2499,这样的计算比较简便。
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第1个回答 2020-03-05
49X51
解:原式=(50+1)(50-1)
=50²-1²
=2500-1
=2499
望采纳!
解:原式=(50+1)(50-1)
=50²-1²
=2500-1
=2499
望采纳!
第2个回答 2020-03-05
这题可以转化成平方差公式:a²-b²=(a+b)(a-b)
49×51
=(50-1)×(50+1)
=50²-1²
=2500-1
=2499
49×51
=(50-1)×(50+1)
=50²-1²
=2500-1
=2499
第3个回答 2020-03-05
56X51十56X49怎样简便计算?
解答:
56X51十56X49
=56x(51+49)
=56x100
=5600
解答:
56X51十56X49
=56x(51+49)
=56x100
=5600
第4个回答 2020-03-05
49X51
=(50+1)(50-1)
=50x50-1x1
=2500-1
=2499本回答被网友采纳
=(50+1)(50-1)
=50x50-1x1
=2500-1
=2499本回答被网友采纳