77×29/78的简算,
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77×29/78的简算,
77×29/78的简算,
77×29/78的简算,
77×29/78
=(78-1)×29/78
=78×29/78-1×29/78
=29-29/78
=28又78分之49
77×29/78的简算,
77×29/78的简算,
77×29/78的简算,
77×29/78
=(78-1)×29/78
=78×29/78-1×29/78
=29-29/78
=28又78分之49