Toán Lớp 7: | x + 2021 | + ( y – 2022)^2 = 0
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Toán Lớp 7: | x + 2021 | + ( y – 2022)^2 = 0
Comments ( 2 )
|x+2021|ge0forallx
(y-2022)^2ge0forally
=>|x+2021|+(y-2022)^2ge0forallx;y
Mà |x+2021|+(y-2022)^2=0
=>{(|x+2021|=0),((y-2022)^2=0):}
=>{(x+2021=0),(y-2022=0):}
=>{(x=0-2021),(y=0+2022):}
=>{(x=-2021),(y=2022):}
Vậy x=-2021;y=2022