已知x+y=27,y+z=33,x+z=30,则x+y+z=?
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已知x+y=27,y+z=33,x+z=30,则x+y+z=?
已知x+y=27,y+z=33,x+z=30,则x+y+z=?
已知x+y=27,y+z=33,x+z=30,则x+y+z=?
将3个等式加起来得2(x+y+z)=90
所以x+y+z=45
45
三式相加即得
三等式相加:
x+y+y+z+x+Z=27+33+30
2(x+y+z)=90
x+y+z=45
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