21.5/[(6.07+2.53)*0.5]
=21.5÷（8.6x0.5）
=21.5÷4.3
=5
21.5/[(6.07+2.53)*0.5]
=21.5*2/[(6.07+2.53)*0.5*2]
=43/(8.6*1)
=43/(4.3*2)
=10/2
=5
=21.5/(8.6*0.5)
=21.5/[(8+0.6)*0.5]
=21.5/(8*0.5+0.6*0.5)
=21.5/(4+0.3)
=21.5/4.3
=215/43
=5
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