|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
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|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
|3x+2y+3|+(5y+2x-9)^2=0
由于平方和绝对值都是非负数
要相加是0 必须同时为0
3x+2y+3 = 0
5y+2x-9=0
x=-3
y=3
3x-2y =-15
绝对值和平方都大于等于0,相加等于0
若有一个大于0,则另一个小于0,不成立。
所以两个都等于0
所以3x+2y+3=0 (1)
5y+2x-9=0 (2)
(1)×19-(2)×12
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3x-2y+15=0
3x-2y=-15
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