Toán Lớp 6: Tìm các số nguyên a, b, c, d biết: a + b + c + d = 1, a + c + d = 2, a + d + b = 3, a + b + c = 4
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Toán Lớp 6: Tìm các số nguyên a, b, c, d biết: a + b + c + d = 1, a + c + d = 2, a + d + b = 3, a + b + c = 4
Comments ( 2 )
=>b=1-(a+cd)=1-2=-1
<=> Vậy b=-1
=>c=1-(a+b+d)=1-3=-2
<=> Vậy c=-2
=>d=1-(a+b+c)=1-4=-3
<=> Vậy d=-3
=>a=1-(-1)-(-2)-(-3)=7
<=> Vậy a=7