配套习题- 如何巧妙构造二元一次方程组解题 -【青果学院】

1/5单选题

难度：

1.已知（x-y+3）²+

=0，则x+y的值为（　　）

A	0
B	-1
C	1
D	5

正确答案：Qw==

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

2/5单选题

难度：

2.已知

是二元一次方程组

的解，则2m-n的算术平方根为（　　）

A	±2
B
C	2
D	4

正确答案：Qw==

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

3/5单选题

难度：

3.已知方程组

的解为

，则2a-3b的值为（　　）

A	4
B	6
C	-6
D	-4

正确答案：Qg==

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

4/5单选题

难度：

4.如果

，其中xyz≠0，那么x：y：z=（　　）

A	1：2：3
B	2：3：4
C	2：3：1
D	3：2：1

正确答案：Qw==

6Kej77ya5bey55+lPGltZyB3aWR0aD0xMzYgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjYvRkEvckJBQ0ZGT1lJYXZBdXRYb0FBQUVHMk83OGVVNTMyLnBuZyI+77yMPGJyPjxpbWcgd2lkdGg9MTYgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQTMvMUUvckJBQ0UxT1lJYXZ5djB3OEFBQUF5bHJTbjdFNTY0LnBuZyI+w5cyLTxpbWcgd2lkdGg9MTYgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjYvRkEvckJBQ0ZGT1lJYXVEMk9WMUFBQUEwamdTaDRJMDcxLnBuZyI+5b6X77yMN3ktMjF6PTDvvIw8YnI+4oi0eT0zeu+8jDxicj7ku6PlhaXikaDlvpfvvIx4PTh6LTZ6PTJ677yMPGJyPuKItHjvvJp577yaej0yeu+8mjN677yaej0y77yaM++8mjEuIDxicj7mlYXpgIlDLiA=

5/5单选题

难度：

5.如果方程组

的解相同，则a+b的值为（　　）

A	-1
B	2
C	1
D	0

正确答案：Qw==

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