2(x-y+z)=2x-2y+2z=4
3x+2y+4z-2x+2y-2z
=x+4y+2z=4-4=0
若3x+2y+4z=4,x-y+z=2,求x+4y+2y的值是多少
若3x+2y+4z=4,x-y+z=2,求x+4y+2y的值是多少
数学人气:318 ℃时间:2019-10-27 09:57:03
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