(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)-(2m-3n)怎么做

问题描述:

(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)-(2m-3n)怎么做

(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)
=(m-3n)^2÷(m-3n)-(2m+3n)(2m-3n)÷(2m-3n)
=m-3n-(2m+3n)
=-m-6n