34x56+56x28怎么巧算
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2016-03-11
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34x56+56x28
=34x56+28x56
=(34+28)x56
=62x56
=(60+2)x56
=60x56+2x56
=3360+112
=3472
=34x56+28x56
=(34+28)x56
=62x56
=(60+2)x56
=60x56+2x56
=3360+112
=3472
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