x+y=27 y+z=33 x+z+=30 解出来
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x+y=27 y+z=33 x+z+=30 解出来
x+y=27 y+z=33 x+z+=30 解出来
x+y=27 y+z=33 x+z+=30 解出来
x+y=27 (1)
y+z=33 (2)
x+z=30 (3)
(1)+(2)+(3)
2x+2y+2z=90
x+y+z=45 (4)
所以
(4)-(2),x=12
(4)-(3),x=15
(4)-(1),x=18
x+y/2=z+x/3=y+z/4 x+y+z=27
(x+y-z)(x-y+z)=
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