作业帮几道初一的合并同类项题①n-{n-2+[5m-3(n+2m)+6n]}+2n②½x-2（x-1/3y²）+（-3/2x+1/3y²）③2（t²-t-1)-(t²-t-1)+3(t²-t-1)④-5（2m-n)-6(2n-3m)⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/28 20:18:02
![几道初一的合并同类项题①n-{n-2+[5m-3(n+2m)+6n]}+2n②½x-2（x-1/3y²）+（-3/2x+1/3y²）③2（t²-t-1)-(t²-t-1)+3(t²-t-1)④-5（2m-n)-6(2n-3m)⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）](/uploads/image/z/1169284-4-4.jpg?t=%E5%87%A0%E9%81%93%E5%88%9D%E4%B8%80%E7%9A%84%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%E9%A2%98%E2%91%A0n-%7Bn-2%2B%5B5m-3%28n%2B2m%29%2B6n%5D%7D%2B2n%E2%91%A1%26%23189%3Bx-2%EF%BC%88x-1%2F3y%26%23178%3B%EF%BC%89%2B%EF%BC%88-3%2F2x%2B1%2F3y%26%23178%3B%EF%BC%89%E2%91%A22%EF%BC%88t%26%23178%3B-t-1%29-%28t%26%23178%3B-t-1%29%2B3%28t%26%23178%3B-t-1%29%E2%91%A3-5%EF%BC%882m-n%29-6%282n-3m%29%E2%91%A4-3%EF%BC%88ab-5b%26%23178%3B%2B2a%26%23178%3B%EF%BC%89-3%EF%BC%887ab%2B1ba%26%23178%3B-25b%26%23178%3B%EF%BC%89)
几道初一的合并同类项题①n-{n-2+[5m-3(n+2m)+6n]}+2n②½x-2（x-1/3y²）+（-3/2x+1/3y²）③2（t²-t-1)-(t²-t-1)+3(t²-t-1)④-5（2m-n)-6(2n-3m)⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）
几道初一的合并同类项题
①n-{n-2+[5m-3(n+2m)+6n]}+2n
②½x-2（x-1/3y²）+（-3/2x+1/3y²）
③2（t²-t-1)-(t²-t-1)+3(t²-t-1)
④-5（2m-n)-6(2n-3m)
⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）
几道初一的合并同类项题①n-{n-2+[5m-3(n+2m)+6n]}+2n②½x-2（x-1/3y²）+（-3/2x+1/3y²）③2（t²-t-1)-(t²-t-1)+3(t²-t-1)④-5（2m-n)-6(2n-3m)⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）
①n-{n-2+[5m-3(n+2m)+6n]}+2n
=n-{n-2+[5m-3n-6m+6n]}+2n
=n-{n-2+[3n-m]}+2n
=n-{4n-2-m}+2n
=n-4n+2+m+2n
=2-n+m
②½x-2（x-1/3y²）+（-3/2x+1/3y²）
=½x-2x+2/3y²-3/2x+1/3y²
=½x-2x+2/3y²-3/2x+1/3y²
= - 3x+y²
③2（t²-t-1)-(t²-t-1)+3(t²-t-1)
=(t²-t-1)(2-1+3)
=4(t²-t-1)
④-5（2m-n)-6(2n-3m)
=-10m+5n-12n+18m
=8m-7n
⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²)
= -3（ab-5b²+2a²-7ab-1ba²+25b²)
= -3（2a²-6ab-1ba²+20b²)
= -3（2a²-6ab-1ba²+20b²)