{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
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{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
5x+2y=13 ……①
3x-2y=-3 ……② ②+①得:x=5/4
将x=5/4代入①,得:y=27/8
2x+3y=5 ……①
4x-2y=1 ……② ①乘以2-② ,得:y=9/8
将y=9/8代入①,得:x=13/16
x+y=11 ……①
y+z=14 ……②
x+z=15 ……③ ①-②,得:x-z=-3 ……④
③+④得:x=6
将x=6代入①,③得:y=5,z=9
x+y+z=6 ……①
x+z=16 ……②
x-y+2z=17 ……③ 将②代入①得:y=-10
将y=-10代入③得:x+2z=7 ……④
由②和④可得:x=25,z=-9
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