四分之二-七分之二+四分之一+七分之二
四分之二-七分之二+四分之一+七分之二
日期:2022-02-10 22:25:16 人气:1
2/4-2/7+1/4+2/7
=(2/4+1/4)+(2/7-2/7)
=3/4+0
=3/4
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=(2/4+1/4)+(2/7-2/7)
=3/4+0
=3/4
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