小明说他解方程组2X+ay=10
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 18:12:03
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小明说他解方程组2X+ay=10
小明说他解方程组2X+ay=10
3X-y=2 时,解得X=2 ,y=b 你知道a和b分别是多少吗?
小明说他解方程组2X+ay=10
x=2,y=b代入
2×2+ab=10
3×2-b=2
由(2)式,b=4
代入(1)式,a=3/2
将x和y代入得
4+ab=10
6-b=2
解得b=4,a=1.5
带入
4+ab=10
6-b=2
解得b=4
a=1.5
3X-y=2,且X=2
所以3×2-Y=2
Y=4
2×2+4a=10
a=1.5
因为Y=b=4
b=4
将X=2 Y=b代入二式 得出b=4
再将X=2 Y=b代入一式 得出4+ab=10
将b=4代入4+ab=10得出a=1.5