2.5×(9/10+9/10+9/10+9/10)
=2.5x4x9/10
=10x9/10
=9
(111+999)÷[56×(3/7-3/8)]
=1110÷[56x3/7-56x3/8]
=1110÷[24-21]
=1110÷3
=370
5分之4+9又5分之4+99又5分之4+999又5分之4+9999又5分之4
=10+100+1000+10000+4/5-4/5
=11110
2.5×(9/10+9/10+9/10+9/10)
=2.5x4x9/10
=10x9/10
=9
(111+999)÷[56×(3/7-3/8)]
=1110÷[56x3/7-56x3/8]
=1110÷[24-21]
=1110÷3
=370
5分之4+9又5分之4+99又5分之4+999又5分之4+9999又5分之4
=10+100+1000+10000+4/5-4/5
=11110