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
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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
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)
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
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平方)÷(20c三次方/30a三次方b十次方)
=-5/12a³b^4c ×30a³b^10/20c³
=-5b^6/8c^4