25%x(m/2)+[0.8(1+25%)-1]x(m/2)的过程

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25%x(m/2)+[0.8(1+25%)-1]x(m/2)的过程
25%x(m/2)+[0.8(1+25%)-1]x(m/2)的过程

25%x(m/2)+[0.8(1+25%)-1]x(m/2)的过程
原式=1/4*m/2+【4/5*5/4-1】*m/2
=1/8m

=0.4x(m/2)+(0.8x1.4-1)x(m/2)=(0.4+1.12-1)x(m/2)=0.52x(m/2)=0.26x