Toán Lớp 6: 64 . 6 + 81 .4 + 17 . 6 ( tính thuận tiện)
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Toán Lớp 6: 64 . 6 + 81 .4 + 17 . 6 ( tính thuận tiện)
Comments ( 2 )
=6(64+17)+81.4
=6.81+81.4
=81(6+4)
=81.10
=810