规定a*b=(a-2.5)-(9/8-b),试计算:(21/4)*{3.5*(3/16)}21/4*(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/

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 13:44:26

规定a*b=(a-2.5)-(9/8-b),试计算:(21/4)*{3.5*(3/16)}21/4*(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/
规定a*b=(a-2.5)-(9/8-b),试计算:(21/4)*{3.5*(3/16)}
21/4*(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

规定a*b=(a-2.5)-(9/8-b),试计算:(21/4)*{3.5*(3/16)}21/4*(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/
先计算{}中的 a*b=(a-2.5)-(9/8-b) 是一个公式 3.5*(3/16)=(3.5-2.5)-(9/8-3/16)=1/16
同理 :(21/4)*(1/16)= *(3/16)=(21/4-2.5)-(9/8-1/16)=27/16