{x-y=500{(1+15%)x-(1-10%)y=950如果(2x-3y+5)的二次方+|x+y-2|=0,求10x-5y+1(绝对值)
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{x-y=500{(1+15%)x-(1-10%)y=950如果(2x-3y+5)的二次方+|x+y-2|=0,求10x-5y+1(绝对值)
{x-y=500
{(1+15%)x-(1-10%)y=950
如果(2x-3y+5)的二次方+|x+y-2|=0,求10x-5y+1
(绝对值)
{x-y=500{(1+15%)x-(1-10%)y=950如果(2x-3y+5)的二次方+|x+y-2|=0,求10x-5y+1(绝对值)
第一题:由x-y=500得 x=500+y 带入②式得 1.15y+500*1.15-0.9y=950 解得y=1500 x=2000
第二题:由(2x-3y+5)的二次方与|x+y-2|的解集都不为负,得两式都等于零.
由x+y-2=0得 x=2-y 带入2x-3y+5=0得 y=1.8 x=0.2
x=8000
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{x-y=500{(1+15%)x-(1-10%)y=950如果(2x-3y+5)的二次方+|x+y-2|=0,求10x-5y+1(绝对值)
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