填空;7/12+【 】=1又1/2-【 】=0.5+【 】=1.25-【 】=1

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填空;7/12+【 】=1又1/2-【 】=0.5+【 】=1.25-【 】=1

填空;7/12+【 】=1又1/2-【 】=0.5+【 】=1.25-【 】=1
填空;7/12+【 】=1又1/2-【 】=0.5+【 】=1.25-【 】=1

填空;7/12+【 】=1又1/2-【 】=0.5+【 】=1.25-【 】=1
7/12+【 5/12】=1又1/2-【1/2 】=0.5+【0.5 】=1.25-【0.25 】=1