中一MATHS
(9-1.8)-(-8.2-11)+(-20)
詳細....THANK YOU
(9-1.8)-(-8.2-11)+(-20)
2007-07-02 12:03 am
回答 (11)
2007-07-04 9:48 pm
(9-1.8)-(-8.2-11)+(- 20)
=7.2- (-19.2) -20
=7.2+ 19.2-20
=6.4
2007-07-04 2:19 am
9 - 1.8 - (-8.2 - 11) + (-20)
= 9 - 1.8 + 8.2 + 11 - 20
= 6.4
= 9 - 1.8 + 8.2 + 11 - 20
= 6.4
2007-07-02 4:42 am
(9-1.8)-(-8.2-11)+(-20)
=7.2-(-19.2)-20
=7.2+19.2-20
=6.4
=7.2-(-19.2)-20
=7.2+19.2-20
=6.4
2007-07-02 4:24 am
(9-1.8)-(-8.2-11)+(-20)
=7.2+19.2-20
=6.4
=7.2+19.2-20
=6.4
2007-07-02 3:36 am
(9-1.8)-(-8.2-11)+(-20)
= 9-1.8+8.2+11-20
= 6.4
= 9-1.8+8.2+11-20
= 6.4
2007-07-02 3:06 am
擦去括號後便是等於﹕
9-1.8--8.2+11+-20
=7.2--8.2+11+-20
=15.4+11-20
=26.4-20
=6.4
9-1.8--8.2+11+-20
=7.2--8.2+11+-20
=15.4+11-20
=26.4-20
=6.4
2007-07-02 2:49 am
1:小心正負數!!
(+) (+) = + (-) (-) = + (+) (-) = - (-) (+) = -
開始~~
( 9 - 1.8 ) - ( - 8.2 - 11 ) + ( - 20 )
= 7.2 - ( -19.2 ) - ( 20 ) <-----------1.處括號數字 2.(+) (-) = -
= 7.2 + 19.2 - ( 20 ) <-----------1. (-) (-) = +
= 26.4 - 20
= 6.4
答案: 6.4
(+) (+) = + (-) (-) = + (+) (-) = - (-) (+) = -
開始~~
( 9 - 1.8 ) - ( - 8.2 - 11 ) + ( - 20 )
= 7.2 - ( -19.2 ) - ( 20 ) <-----------1.處括號數字 2.(+) (-) = -
= 7.2 + 19.2 - ( 20 ) <-----------1. (-) (-) = +
= 26.4 - 20
= 6.4
答案: 6.4
2007-07-02 12:22 am
(9-1.8)-(-8.2-11)+(-20)
= 9 - 1.8 + 8.2 +11 -20 (負負得正)
= 9 + 11 -20 + 8.2 - 1.8
= 0 + 8.2 - 1.8
= 6.4
= 9 - 1.8 + 8.2 +11 -20 (負負得正)
= 9 + 11 -20 + 8.2 - 1.8
= 0 + 8.2 - 1.8
= 6.4
收錄日期: 2021-04-12 21:46:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070701000051KK02612