配套习题- 三元一次方程组的解法 -【青果学院】

1/5单选题

难度：

1.下列是三元一次方程组的是()

A
B
C
D

正确答案：Qg==

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

2/5单选题

难度：

2.18. 甲、乙、丙三数的和是26，甲数比乙数大1，甲数的两倍与丙数的和比乙数大18，设这三个数分别为

那么甲、乙、丙这三个数分别是( )．

A
B
C
D

正确答案：QQ==

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

3/5单选题

难度：

3.解方程组

，若要使运算简便，消元的方法应选取()

A	先消去x
B	先消去y
C	先消去z
D	以上说法都不对

正确答案：Qg==

6Kej562U77ya4oi1WeeahOezu+aVsOaYrzHmiJYtMTxicj7miYDku6XlhYjmtoh5PGJyPuaVhemAiUI=

4/5单选题

难度：

4.若三元一次方程组

的解使

，则a的值是( ）

A	0
B
C
D

正确答案：Qg==

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

5/5单选题

难度：

5.已知

的解是

，则

，

的值是()

A
B
C
D

正确答案：Qw==

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