来自金艺的问题
合并同类项,去括号7a+3(a+3b)7a+3(a+3b)3x-(4y-2y+1)
合并同类项,去括号7a+3(a+3b)
7a+3(a+3b)
3x-(4y-2y+1)
1回答
2020-07-1714:23
合并同类项,去括号7a+3(a+3b)7a+3(a+3b)3x-(4y-2y+1)
合并同类项,去括号7a+3(a+3b)
7a+3(a+3b)
3x-(4y-2y+1)
7a+3(a+3b)
=7a+3a+9b
=10a+9b
3x-(4y-2y+1)
=3x-4y+2y-1
=3x-2y-1