Please find the unknown.You shouls show all the steps.
(a+20)+(a+10)+50+(5a-5)=180
Simple equestion
2006-11-19 7:48 pm
回答 (10)
2006-11-19 7:52 pm
✔ 最佳答案
(a+20)+(a+10)+50+(5a-5)=180 a+20+a+10+50+5a-5=180
(a+a+5a)+20+10+50-5=180
7a+75=180
7a=180-75
7a=105
a=15
參考: me
2006-11-19 8:38 pm
a+20+a+10+50+5a-5=180
7a+75=180
7a=115
a=15
7a+75=180
7a=115
a=15
2006-11-19 8:27 pm
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
2006-11-19 8:17 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180 (The distributive law of multiplication)
a+a+5a+20+10+50-5=180 (Collecting the like terms)
7a+75=180 (Simplification)
7a=105
a=15
Check:
L.H.S.=(a+20)+(a+10)+50+(5a-5)
=(15+20)+(15+10)+50+[5(15)-5]
=35+25+50+70
=180
=R.H.S.
Therefore a=15 satisfies the equation.
a+20+a+10+50+5a-5=180 (The distributive law of multiplication)
a+a+5a+20+10+50-5=180 (Collecting the like terms)
7a+75=180 (Simplification)
7a=105
a=15
Check:
L.H.S.=(a+20)+(a+10)+50+(5a-5)
=(15+20)+(15+10)+50+[5(15)-5]
=35+25+50+70
=180
=R.H.S.
Therefore a=15 satisfies the equation.
2006-11-19 8:01 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
2006-11-19 7:55 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=180-75
7a=105
a=105/7
a=15
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=180-75
7a=105
a=105/7
a=15
2006-11-19 7:53 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
a+20+a+10+50+5a-5=180
a+a+5a+20+10+50-5=180
7a+75=180
7a=105
a=15
2006-11-19 7:51 pm
(a+20)+(a+10)+50+(5a-5)=180
7a+75=180
7a=105
a=15
7a+75=180
7a=105
a=15
2006-11-19 7:51 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180
7a=105
a=15
a+20+a+10+50+5a-5=180
7a=105
a=15
2006-11-19 7:50 pm
(a+20)+(a+10)+50+(5a-5)=180
a+20+a+10+50+5a-5=180
7a+75=180
7a=105
∴a=15
a+20+a+10+50+5a-5=180
7a+75=180
7a=105
∴a=15
收錄日期: 2021-04-12 23:45:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061119000051KK01585