已知2x+y+3z=125,x+4y+5z=185,求x+2y+3z的值大神们帮帮忙
问题描述：
已知2x+y+3z=125,x+4y+5z=185,求x+2y+3z的值大神们帮帮忙
答
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
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