数学二元一次方程：｛2x--4y=6 3x+2y=17 超急!火速!今天必须要有答案!
人气：227 ℃ 时间：2020-02-23 09:18:51
解答
2x-4y=6 ①
3x+2y=17 ②
②*2=6x+4y=34 ③
①+③=2x-4y+6x+4y
6+34=40
8x=40
x=5
带入①
15+2y=17
2y=17-15=2
y=1
所以
x=5,y=1
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