(5x - 7y + 8z) - (-2x + 3y -z) ??
回答 (3)
2008-07-02 3:02 pm
✔ 最佳答案
(5x - 7y + 8z) - (-2x + 3y -z)= 5x - 7y + 8z + 2x - 3y + z ..distribute the negative sign or the negative 1.
= 7x - 10y + 9z .. add like terms.
hope it helped. ^_^
2008-07-02 9:57 pm
(5x - 7y + 8z) - (-2x + 3y - z)
= 5x - 7y + 8z + 2x - 3y + z
= 5x + 2x - 7y - 3y + 8z + z
= 7x - 10y + 9z
= 5x - 7y + 8z + 2x - 3y + z
= 5x + 2x - 7y - 3y + 8z + z
= 7x - 10y + 9z
2008-07-02 9:58 pm
7x -10y + 9z
Just add x, y and z respectively and remember to change the sign of each term inside the second brackets
Just add x, y and z respectively and remember to change the sign of each term inside the second brackets
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080702065330AAhhDYN