Question

解{x+y+z=1 2x+3y+2z=2 x+5y+19z=4要过程,答对给满意

Answer 1

x+y+z=1 ①

2x+3y+2z=2 ②

x+5y+19z=4 ③

由②-2×①得 y=0

由③-①得 4y+18z=3 ④

将y=0代入④得 4+18z=3 z=1/6

将y=0 z=1/6 代入①得 x+0+1/6=1 x=5/6

所以x=5/6 y=1 z=1/6

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