x= 4(y+1) / 5 代入 2x+9y=97 ,求 x,y 我做法 : 2 (4(y+1) / 5 ) + 9y=97 但我計到既答案的分數黎.. 我數學好差...可唔可以敎下我點做,...ans係 y=9, x=8 thx?

2015-12-28 2:11 pm

回答 (2)

2015-12-30 3:51 am
x= 4(y+1) / 5 i
2x+9y=97 ii
代i入ii
2(4)(y+1)/5+9y=97
8y+8+45y=485
53y=477
y=9
代y=9入i
x=4(9+1)/5
x=8
(x,y)=(8,9)
2015-12-28 4:46 pm
As follow~


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