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mathematics thx!!!
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最佳解答:
1) 1/3(2m+1)-1=1-m 2/3m=1-m 2/3m+m=1-m+m 5/3m=1 5m/3x3=1x3 5m=3 m=3/5 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g - 16 = 14 - 19 - g -2g - 16 = - 5 - g -2g -16 + 16 + g= - 5 - g + g + 16 - g = 11 g = - 11 2007-08-17 13:39:21 補充： 1) 1/3(2m+1)-1=1-m2/3m+1/3-1=1-m2/3m-2/3=1-m2/3m-2/3+2/3+m=1-m+m+2/35/3m=5/3m=1唔好意思...上面1)計錯左 2007-08-17 13:44:05 補充： 2) 7g-(9g-16)=14-(19-g)7g-9g+16=14-19+g-2g+16= -5+g-2g+16-16-g= -5+g-g-16-3g= -21 g=7所以正確答案係1)m=12)g=7唔好意思...補充內容嘅答案先至岩... 2007-08-17 13:44:53 補充： 我覆過數啦...一定岩呀
其他解答:
1)5/3 2)3|||||1) 1/3 (2m+1) = 1 - m +1 (2m+1) = 3m 1 = 3m - 2m 1 = m 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g -2g + 16 = -5 + g 21 = 3g 7 = g|||||Qs: No.1 ------ 1/3 (2m + 1) - 1 = 1 - m. 1/3 (2m + 1) - 1 + 1 =1 - m +1 1/3 (2m + 1) =2 - m 1/3 (2m + 1) X 3 = (2 - m) X 3 2m + 1 = 6 - 3m 2m +1 -1 = 6 - 3m - 1 2m = 5 - 3m 2m + 3m = 5 - 3m + 3m 2m + 3m = 5 5m = 5 5m/5 =5/5 m = 1 --------------------------------------------------------------------------- Qs: No.2 ------ 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g - 2g + 16 = -5 + g - 2g + 16 + 2g = -5 +g +2g 16 = -5 + 3g 16+5 = -5 + 3g + 5 21 = 3g 3g = 21 3g / 3 = 21 / 3 g = 7 ----------------------------------------------------------------- Of course, these steps are too long, (but I write them so that you can understand it better) thus I have also written a and shorter solution for you: 1) 1/3 (2m + 1) - 1 = 1 - m 1/3 (2m+1) = 2-m 2m+1= 3(2-m) 2m+1= 6-3m 5m=5 m=1 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14- 19 + g 16 - 14 +19 = g - 7g + 9g 21 = 3g g = 7 ----------------------------------------------------------------------------------------------|||||1) 1/3 (2m + 1) - 1 = 1 - m 1/3 (2m + 1) = 1 - m + 1 1/3 (2m + 1) =2 - m (2m + 1) =6 - 3m 2m + 3m =6 - 1 5m = 5 m = 1 Check: 1/3 (2m + 1) - 1 = 1 - m (m = 1) 1/3 (2x1+1) -1 = 1-1 1/3 (3) -1 = 0 1-1=0 0=0 correct. 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g -2g + 16 = -5 + g -2g - g = -5 - 16 - 3g = -21 g = 7 Check: 7g - ( 9g - 16 ) = 14 - ( 19 - g ) (g = 7) 7( 7 )- (9 ( 7 ) -16) = 14- (19 - 7) 49 - 47 = 14- 12 2 = 2 correct.|||||1)1/3(2m+1)-1=1-m 1/3(2m+1)=2-m 2m+1=6-3m 2m+3m=6-1 5m=5 m=1 2)7g-(9g-16)=14-(19-g) 7g-9g+16=14-19+g 16-2g=g-5 3g=21 g=7|||||1) Slove the equation 1/3 (2m + 1) - 1 = 1 - m. 2m+1-1=3-3m 2m+3m=3 5m=3 m=3/5 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g-9g+16=14-19+g -2g+16=-5+g -2g-g=-5-16 -3g=-21 g=7 2007-08-17 13:46:44 補充： sorry!!!!!1) 1/3(2m+1)-1=1-m2/3m+1/3-1=1-m2/3m-2/3=1-m2/3m-2/3+2/3+m=1-m+m+2/35/3m=5/3m=1|||||1)5/3 2)3|||||question 1) m=2/5 question 2) g=7
mathematics thx!!!
發問:
此文章來自奇摩知識+如有不便請留言告知
Linear Equation in One Unknown 1) Slove the equation 1/3 (2m + 1) - 1 = 1 - m. 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) thank you very much ~~最佳解答:
1) 1/3(2m+1)-1=1-m 2/3m=1-m 2/3m+m=1-m+m 5/3m=1 5m/3x3=1x3 5m=3 m=3/5 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g - 16 = 14 - 19 - g -2g - 16 = - 5 - g -2g -16 + 16 + g= - 5 - g + g + 16 - g = 11 g = - 11 2007-08-17 13:39:21 補充： 1) 1/3(2m+1)-1=1-m2/3m+1/3-1=1-m2/3m-2/3=1-m2/3m-2/3+2/3+m=1-m+m+2/35/3m=5/3m=1唔好意思...上面1)計錯左 2007-08-17 13:44:05 補充： 2) 7g-(9g-16)=14-(19-g)7g-9g+16=14-19+g-2g+16= -5+g-2g+16-16-g= -5+g-g-16-3g= -21 g=7所以正確答案係1)m=12)g=7唔好意思...補充內容嘅答案先至岩... 2007-08-17 13:44:53 補充： 我覆過數啦...一定岩呀
其他解答:
1)5/3 2)3|||||1) 1/3 (2m+1) = 1 - m +1 (2m+1) = 3m 1 = 3m - 2m 1 = m 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g -2g + 16 = -5 + g 21 = 3g 7 = g|||||Qs: No.1 ------ 1/3 (2m + 1) - 1 = 1 - m. 1/3 (2m + 1) - 1 + 1 =1 - m +1 1/3 (2m + 1) =2 - m 1/3 (2m + 1) X 3 = (2 - m) X 3 2m + 1 = 6 - 3m 2m +1 -1 = 6 - 3m - 1 2m = 5 - 3m 2m + 3m = 5 - 3m + 3m 2m + 3m = 5 5m = 5 5m/5 =5/5 m = 1 --------------------------------------------------------------------------- Qs: No.2 ------ 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g - 2g + 16 = -5 + g - 2g + 16 + 2g = -5 +g +2g 16 = -5 + 3g 16+5 = -5 + 3g + 5 21 = 3g 3g = 21 3g / 3 = 21 / 3 g = 7 ----------------------------------------------------------------- Of course, these steps are too long, (but I write them so that you can understand it better) thus I have also written a and shorter solution for you: 1) 1/3 (2m + 1) - 1 = 1 - m 1/3 (2m+1) = 2-m 2m+1= 3(2-m) 2m+1= 6-3m 5m=5 m=1 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14- 19 + g 16 - 14 +19 = g - 7g + 9g 21 = 3g g = 7 ----------------------------------------------------------------------------------------------|||||1) 1/3 (2m + 1) - 1 = 1 - m 1/3 (2m + 1) = 1 - m + 1 1/3 (2m + 1) =2 - m (2m + 1) =6 - 3m 2m + 3m =6 - 1 5m = 5 m = 1 Check: 1/3 (2m + 1) - 1 = 1 - m (m = 1) 1/3 (2x1+1) -1 = 1-1 1/3 (3) -1 = 0 1-1=0 0=0 correct. 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g - 9g + 16 = 14 - 19 + g -2g + 16 = -5 + g -2g - g = -5 - 16 - 3g = -21 g = 7 Check: 7g - ( 9g - 16 ) = 14 - ( 19 - g ) (g = 7) 7( 7 )- (9 ( 7 ) -16) = 14- (19 - 7) 49 - 47 = 14- 12 2 = 2 correct.|||||1)1/3(2m+1)-1=1-m 1/3(2m+1)=2-m 2m+1=6-3m 2m+3m=6-1 5m=5 m=1 2)7g-(9g-16)=14-(19-g) 7g-9g+16=14-19+g 16-2g=g-5 3g=21 g=7|||||1) Slove the equation 1/3 (2m + 1) - 1 = 1 - m. 2m+1-1=3-3m 2m+3m=3 5m=3 m=3/5 2) 7g - ( 9g - 16 ) = 14 - ( 19 - g ) 7g-9g+16=14-19+g -2g+16=-5+g -2g-g=-5-16 -3g=-21 g=7 2007-08-17 13:46:44 補充： sorry!!!!!1) 1/3(2m+1)-1=1-m2/3m+1/3-1=1-m2/3m-2/3=1-m2/3m-2/3+2/3+m=1-m+m+2/35/3m=5/3m=1|||||1)5/3 2)3|||||question 1) m=2/5 question 2) g=7
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