如题所述
(2a - 7b)x + (3a - 8b) = 8x + 10
2a - 7b = 8 (1)
3a - 8b = 10 (2)
6a - 21b = 24 (3)
6a - 16b = 20 (4)
(4) - (3) å¾
5b = - 4
b = - 4/5ï¼ä»£å ¥(2) æ (1) ä¸ï¼
a = 1.2
æ以ï¼
a = 1.2
b = - 0.8
2a - 7b = 8 (1)
3a - 8b = 10 (2)
6a - 21b = 24 (3)
6a - 16b = 20 (4)
(4) - (3) å¾
5b = - 4
b = - 4/5ï¼ä»£å ¥(2) æ (1) ä¸ï¼
a = 1.2
æ以ï¼
a = 1.2
b = - 0.8
温馨提示：答案为网友推荐，仅供参考
第1个回答 2012-06-22
对应系数相等
(2a - 7b）=8
(3a - 8b)=10
得a=6/5 b=-4/5
解毕！~
(2a - 7b）=8
(3a - 8b)=10
得a=6/5 b=-4/5
解毕！~
第2个回答 2012-06-22
解
由题设可得
2a-7b=8
3a-8b=10
解得: a=6/5, b=-4/5
由题设可得
2a-7b=8
3a-8b=10
解得: a=6/5, b=-4/5
第3个回答 2012-06-22
2a-7b=0
3a-8b=0
2a-7b+a-b=0
a-b=0
a=b
2a-7b>8
2a-7a>8
a=b<-8/5
3a-8b=0
2a-7b+a-b=0
a-b=0
a=b
2a-7b>8
2a-7a>8
a=b<-8/5
