规定a*b=(a-2.5)-(1又1/8-b),试求5又1/4*(3.5*3/16)的值.

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规定a*b=(a-2.5)-(1又1/8-b),试求5又1/4*(3.5*3/16)的值.
规定a*b=(a-2.5)-(1又1/8-b),试求5又1/4*(3.5*3/16)的值.

规定a*b=(a-2.5)-(1又1/8-b),试求5又1/4*(3.5*3/16)的值.
5又1/4*(3.5*3/16)
=21/4*(7/2*3/16)
=21/4*[(7/2-2.5)-(9/8-3/16)]
=21/4*[(7/2-5/2)-(18/16-3/16)]
=21/4*(1-15/16)
=21/4*1/16
=(21/4-2.5)-(9/8-1/16)
=(21/4-5/2)-(18/16-1/16)
=(21/4-10/4)-(18/16-1/16)
=11/4-17/16
=44/16-17/16
=27/16
=1+11/16
=1又1/16