帮我解这些方程啊.一个过程就行.1.4x+y-z=12 3x+2y+z=-5 x-y+5z=12.2a+7b=3 3a-c=1 -b+3c=43.x:y=3:2 y:Z=5:4 x+y+z=664.a-d=-4 d-2y=-1 a+s-d=-15.a=6s a-4=10s-20d a+12=3y+18d6.a+s=8 a+d=6 s+d=107.3(a+s-d)=15(d-a) 5(a+s-d)=400 15+53/6(a+s)=10000
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