若m-2n=2,n-a=-3,a-1/2b=5,则(m-2a)(m-b)÷(2n-b)的值(要过程)求大神帮助

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若m-2n=2,n-a=-3,a-1/2b=5,则(m-2a)(m-b)÷(2n-b)的值(要过程)求大神帮助若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(要过程)求大神帮助
若m-2n=2,n-a=-3,a-1/2b=5,则(m-2a)(m-b)÷(2n-b)的值(要过程)求大神帮助

若m-2n=2,n-a=-3,a-1/2b=5,则(m-2a)(m-b)÷(2n-b)的值(要过程)求大神帮助
n-a-(a-b/2)=-3-5 n-b/2=-8,2n-b=-16 m-2n+2(n-a)=2-3*2 m-2a=-4 m-2a+2(a-b/2)=2+2*5 m-b=12 所以(m-2a)(m-b)/(2n-b) =-4*12/(-16) =3