解
x+2z=3 ①
2x+y=4 ②
2y+z=5 ③
由①得:x=3-2z ④
代入②得:2(3-2z)+y=4
即y-4z=-2 ⑤
③×4得:8y+4z=20 ⑥
⑤+⑥得:9y=18
∴y=2,z=1,x=1
x+2z=3,2x+y=4,2y+z=5
x+2z=3,2x+y=4,2y+z=5
用代入法
用代入法
數(shù)學(xué)人氣:217 ℃時(shí)間:2020-02-05 12:22:37
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