中科新闻网读读日报类似的app:数学简算
来源：百度文库 编辑：中科新闻网 时间：2024/04/30 11:05:58
9999*7778+3333*6666
5.6*69.32+138.64*0.05+693.2*0.43
1234567891的2次方-1234567890*1234567892
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讲一讲过程
5.6*69.32+138.64*0.05+693.2*0.43
1234567891的2次方-1234567890*1234567892
谢谢
讲一讲过程
9999*7778+3333*6666
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
5.6*69.32+138.64*0.05+693.2*0.43
=5.6*69.32+69.32+69.32*4.3
=69.32*(5.6+1+3.4)
=69.32*10
=693.2
1234567891^2-1234567890*1234567892
=1234567891^2-(1234567891-1)*(1234567891+1)
=1234567891^2-1234567891^2+1
=1
9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
5.6*69.32+138.64*0.05+693.2*0.43
=6932*0.056+(6932*0.02)*0.05+6932*0.043
=6932*(0.056+0.001+0.043)
=6932*0.1
=693.2
1234567891的2次方-1234567890*1234567892
=1234567891的2次方-(1234567891-1)*(1234567891+1)
=1234567891的2次方-1234567891的2次方+1
=1
99990000.
693.2.
1.