12又7/13-(4又1/4+3又1/13)-0.75=

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12又7/13-(4又1/4+3又1/13)-0.75=

12又7/13-(4又1/4+3又1/13)-0.75=
12又7/13-(4又1/4+3又1/13)-0.75=

12又7/13-(4又1/4+3又1/13)-0.75=
详细解答步骤如下:
12又7/13-(4又1/4+3又1/13)-0.75
=12又7/13 - 4又1/4 - 3又1/13 - 0.75
=(12又7/13 - 3又1/13)- (4又1/4 +0.75)
=9又6/13 - (4.25 + 0.75)
=9又6/13 - 5
=4又6/13