99.9*99.9+199.9简便算法.
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99.9*99.9+199.9简便算法.
99.9*99.9+199.9=10179.91
=99.9×99.9+99.9+100
=99.9×(99.9+1)+100
=99.9×100.9+100
=(100-0.1)×100.9+100
=10090-10.09+100
=10179.91
再问: 能不能把解释写上
再答: 99.9*99.9+199.9= 10179.91 =99.9×99.9+99.9+100 (把199.9分成99.9+100) =99.9×(99.9+1)+100 (提起公因数99.9) =99.9×100.9+100 =(100-0.1)×100.9+100 (把99.9分成100-0.1,以便下面大数相乘) =10090-10.09+100 =10179.91
再问: 三克油!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
=99.9×99.9+99.9+100
=99.9×(99.9+1)+100
=99.9×100.9+100
=(100-0.1)×100.9+100
=10090-10.09+100
=10179.91
再问: 能不能把解释写上
再答: 99.9*99.9+199.9= 10179.91 =99.9×99.9+99.9+100 (把199.9分成99.9+100) =99.9×(99.9+1)+100 (提起公因数99.9) =99.9×100.9+100 =(100-0.1)×100.9+100 (把99.9分成100-0.1,以便下面大数相乘) =10090-10.09+100 =10179.91
再问: 三克油!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1