Question

x+y+z=40 x+y+z+z=50 x+y+y+z=60 x、y、z各是多少

x、y、z数字不能相同

Answer 1

x+y+z=40(1) x+y+z+z=50(2) x+y+y+z=60 (3)
(2)-(1)得：z=10
(3)-(1)得：y=20
把y=20,z=10,代入（1）得：x=10

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Answer 2

z=50-40=10
y=60-40=20
x=40-10-20=10

Answer 3

X=10，Y=20，Z=10