更新1:
請盡量將算式簡單化!!!!!!!!!!!!!!拜託拜託!
救命啊~各位數學高手幫幫我吧! 1.因式分解(x-y)(x+3y)^2-(x-y)^2(x+3y) 2.潔西卡拿著5公尺的梯子，在離牆4公尺處斜放於牆邊，唯恐梯子下滑她又將梯子往牆的方向推進1公尺，是球梯頂上移了多少公尺? 細屑各位，請盡量將算是簡單化!!!!!!!!!!!!!!?
回答 (1)
2017-11-08 11:33 pm
牆身要垂直地面
1)(x-y)(x+3y)^2-(x-y)^2(x+3y)
=(x-y)(x+3y)[(x+3y)-(x-y)]
=4y(x-y)(x+3y)
2)[5^2-(4-1)^2]^(1/2)-(5^2-4^2)^(1/2)
=1
1)(x-y)(x+3y)^2-(x-y)^2(x+3y)
=(x-y)(x+3y)[(x+3y)-(x-y)]
=4y(x-y)(x+3y)
2)[5^2-(4-1)^2]^(1/2)-(5^2-4^2)^(1/2)
=1
收錄日期: 2021-04-24 00:47:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20171108134709AAI1btC