could someone tell me how to solve a=(a+70)-(a+30) !!!!!?
回答 (9)
2008-04-01 6:41 am
✔ 最佳答案
a = (a+70)-(a+30)= a + 70 - a - 30
= 40
2008-04-01 1:43 pm
a = (a + 70) - (a + 30)
a = a + 70 - a - 30
a = 40
Answer: a = 40
Proof:
40 = (40 + 70) - (40 + 30)
40 = 110 - (70)
40 = 110 - 70
40 = 40
a = a + 70 - a - 30
a = 40
Answer: a = 40
Proof:
40 = (40 + 70) - (40 + 30)
40 = 110 - (70)
40 = 110 - 70
40 = 40
2008-04-01 4:46 pm
a = 70 - 30
a = 40
a = 40
2008-04-01 4:41 pm
a = (a + 70) - (a + 30)
a = a + 70 - a - 30
a - a + a = 70 - 30
a = 40
a = a + 70 - a - 30
a - a + a = 70 - 30
a = 40
2008-04-01 2:07 pm
First, distribute the negative sign in the second term of the right-hand side:
a=(a+70)-a-30
You can remove the parentheses now since all that's left is addition and subtraction:
a=a+70-a-30
Combine the a and the -a, which cancel out:
a=70-30
Just use basic arithmetic now to get:
a=40
-IMP ;) :)
a=(a+70)-a-30
You can remove the parentheses now since all that's left is addition and subtraction:
a=a+70-a-30
Combine the a and the -a, which cancel out:
a=70-30
Just use basic arithmetic now to get:
a=40
-IMP ;) :)
2008-04-01 1:57 pm
first removal ()
then solve for a
check the answer in the end
a=(a+70)-(a+30)
a=a+70-a-30 ; see a cancel out right side
a=40
then solve for a
check the answer in the end
a=(a+70)-(a+30)
a=a+70-a-30 ; see a cancel out right side
a=40
2008-04-01 1:49 pm
a=(a+70)-(a+30)
Everything in the second parenthesis is being subtracted.
Therefore:
a=a+70-a-30
a-a = 0 and 70-30=40, so:
a=40
I hope I helped!
Everything in the second parenthesis is being subtracted.
Therefore:
a=a+70-a-30
a-a = 0 and 70-30=40, so:
a=40
I hope I helped!
2008-04-01 1:42 pm
a=a+70+(-a)+(-30)
The a and (-a) cancel. You are left with:
a=70+(-30)
a=40
The a and (-a) cancel. You are left with:
a=70+(-30)
a=40
2008-04-01 1:41 pm
a= 40
=p
=p
收錄日期: 2021-05-01 10:20:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080331223430AA3iYdf