100×79+184×21+84×79这道题的简便算法怎么算?

100×79+184×21+84×79这道题的简便算法怎么算?
100×79+184×21+84×79这道题的简便算法怎么算?

100×79+184×21+84×79这道题的简便算法怎么算?
100×79+184×21+84×79
=79×(100+84)+184×21
=79×184+184×21
=184×(79+21)
=184×100
=18400

79*(100+84)+184*21
=79*184+184*21
=184*(79+21)
=184*100
=18400

100×79+184×21+84×79
=(100+84)*79+184*21
=184*79+184*21
=184*(79+21)
=184*100
=18400

100×79+184×21+84×79
=100×79+100×21+84×21+84×79
=100×（79+21）+84×（79+21）
=100×100+84×100
=10000+8400
=18400