Question

忧颜殇f郁花逝{二分之一x-y=三分之一z x-y-1=z 4x-5y+3z=5

Answer 1

1/2x-y=1/3z ①

x-y-1=z ②

4x-5y+3z=5 ③

整理①、②得

3x-6y-2z=0 ④

x-y-z=1 ⑤

④-⑤*2得 x-4y=-2 ⑥

③+⑤*3得 7x-8y=8 ⑦

⑦-⑥*7得20y=22

解得y=11/10

代入⑥得x=12/5

代入②得z=3/10