若m-2n=2,n-a=-3,a-1/2b=5则(m-2a)(m-b)/(2n-b)的值

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若m-2n=2,n-a=-3,a-1/2b=5则(m-2a)(m-b)/(2n-b)的值
若m-2n=2,n-a=-3,a-1/2b=5则(m-2a)(m-b)/(2n-b)的值

若m-2n=2,n-a=-3,a-1/2b=5则(m-2a)(m-b)/(2n-b)的值
由m-2n=2,n-a=-3得m-2a=-4
由m-2a=-4,a-1/2b=5得m-b=-14
由m-2n=2,m-b=-14得2n-b=-16
所以(m-2a)(m-b)/(2n-b)=(-4)*(-14)/(-16)=-7/2