Toán Lớp 6: Tìm y,x,z ∈ Z biết : x – y = -9 , y – z = -10 , z + x = 11
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Toán Lớp 6: Tìm y,x,z ∈ Z biết : x – y = -9 , y – z = -10 , z + x = 11
Comments ( 2 )
=>2x=-8
=>x=-4
=>y=-4-(-9)
=>y=5
=>z=11-(-4)
=>z=15