2式乘以2和一式相减,得出Y+Z=35,再把 Y+Z=35带入一式,X+Z=45,x+2y+3z=X+Z+2(Y+Z)=45+70=115
已知2x+y+3z=125,x+4y+5z=185,求x+2y+3z的值大神们帮帮忙
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