①(m+2n/n-m)-(n/m-n)+(2m/n-m) ②(3a+2b/5a²b)+(a+b/5a²b)-(b-a/5a²b)
问题描述:
①(m+2n/n-m)-(n/m-n)+(2m/n-m) ②(3a+2b/5a²b)+(a+b/5a²b)-(b-a/5a²b)
①(m+2n/n-m)-(n/m-n)+(2m/n-m)
②(3a+2b/5a²b)+(a+b/5a²b)-(b-a/5a²b)
③(5c/2a平方b四次方)÷(-6ab六次方c平方)÷(20c三次方/30a三次方b十次方)
答
①(m+2n/n-m)-(n/m-n)+(2m/n-m) =(m+2n+n+2m)/(n-m)=(3m+3n)/(n-m)②(3a+2b/5a²b)+(a+b/5a²b)-(b-a/5a²b)=(3a+2b+a+b-b+a)/(5a²b)=(5a+2b)/(5a²b)③(5c/2a平方b四次方)÷(-6ab六次方c...