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怎么简便计算66×21+19×21+85×19=?
人气:253 ℃ 时间:2019-10-11 13:20:54
解答
66×21+19×21+85×19 =(66+19)×21+85×19 =85×21+85×19 =85×(21+19) =85×40 =3400 希望能够帮助你!1
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