1666×333+738×999
=1666×333+738×3×333
=333×(1666+2214)
=333×3980
=1325340
解: 1666x333+738x999
=333ⅹ(1666+738x3)
=333x(1666+2214)
=333ⅹ3880
=3x3880x111
=11640x111
=1292040
标签:1666x333,738x999,简便
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