để |x+1|+|x-y+2|=0 thì |x+1|=|x-y+2|=0
ta có:|x+1|=0 suy ra x=-1
|x-y+2|=0 suy ra |-1-y+2|=0 suy ra |1-y|=0 suy ra y=1
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Cau 1; cho\(\frac{x}{2}=\frac{y}{5}\)vaxy=90. So cap (x;y) thoa man la
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Cau 3 :GTLN cua phan so \(\frac{7n-8}{2n-3}\)
Cau 4: Cho A=\(\frac{12}{x-15}\) dieu kien de 0<A<1 va A>1
Cau 5 ; tim x biet /-x-5//x=5=10
Cau 6: tap hop cac so nguyen cua x thoa man (3x^2-51)^2014=(-24)^2014
Cau 7: tap hop cac so thoa man /x-y/+/y+9/25/=0
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