Toán Lớp 7: Tìm x,y biết: |2021 – x| + |2y – 2022| = 0
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Toán Lớp 7: Tìm x,y biết: |2021 – x| + |2y – 2022| = 0
Comments ( 2 )
$#Star$
Bạn xem hình !
Ta có : | 2021 – x | $\geq$ 0 ∀ x
|2y – 2022| $\geq$ 0 ∀ y
Mà |2021 – x| + |2y – 2022| = 0
=> $\left \{ {{2021-x=0} \atop {2y-2022=0}} \right.$
=> $\left \{ {{x=2021} \atop {y=1011}} \right.$
Vậy x = 2021 ; y =1011
#nhi1812