Toán Lớp 6: Tìm x,y biết:
I 2-(x+1) I+ I y-2-3 I bé thua hoặc bằng 0
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Toán Lớp 6: Tìm x,y biết:
I 2-(x+1) I+ I y-2-3 I bé thua hoặc bằng 0
Comments ( 2 )
Mà |2 – (x + 1)| ; |y – 2 – 3| ≥ 0 \forall x, y ∈ ZZ
=> |2 – (x + 1)| + |y – 2 – 3| = 0
=> {(2 – (x + 1) = 0),(y – 2 – 3 = 0):}
=> {(x + 1 = 2),(y – 5 = 0):}
=> {(x = 1),(y = 5):}