Question

9、初二数学题求助（先化简再求值），要有过程，会采纳的！

Answer 1

谔谔，马上就要期末考试了，这种题基本题你还不会，真为你担心。（我也初二，马上期末考了，好紧张~）废话好像有点多了，说正题吧。原式=.M-4/m^2-9乘以(1+14M-7/m^2-8m+16)除以1/m-3,
=[(m-4)/(m+3)(m-3)]*[1+7(2m-1)/(m-4)²]*(m-3)
=[(m-4)/(m+3)]*[(m²-8m+16+14m-7)/(m-4)²]
=(m²+6m+9)/(m+3)(m-4)
=(m+3)²/(m+3)(m-4)
=(m+3)/(m-4)
当m=5时
原式=(5+3)/(5-4)=8

Answer 2

原式=.M-4/m^2-9乘以(1+14M-7/m^2-8m+16)除以1/m-3,
=[(m-4)/(m+3)(m-3)]*[1+7(2m-1)/(m-4)²]*(m-3)
=[(m-4)/(m+3)]*[(m²-8m+16+14m-7)/(m-4)²]
=(m²+6m+9)/(m+3)(m-4)
=(m+3)²/(m+3)(m-4)
=(m+3)/(m-4)
当m=5时
原式=(5+3)/(5-4)=8

Answer 3