配套习题- 代入消元法解二元一次方程组 -【青果学院】

1/5单选题

难度：

1.已知方程2x+3y=6，当x=2时，y=____.当y=-1时，x=____.

A	2,3
B	,
C
D	3,2

正确答案：Qw==

5oqKeD0y5Luj5YWl5pa556iLMngrM3k9Nu+8jOW+l++8mjQrM3k9Nizop6PlvpfvvJp5PTxpbWcgd2lkdGg9MTAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQUEvQUQvckJBQ0ZGVEprYnpqbHFwekFBQUJUMHMtV3lNNTIxLnBuZyI+77yb5oqKeT0tMeS7o+WFpeaWueeoizJ4KzN5PTbvvIzlvpfvvJoyeC0zPTYs6Kej5b6XeD08aW1nIHdpZHRoPTEwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0ZBL3JCQUNKbFRKa2J5amwyS0xBQUFCV1FNZUJYRTczOS5wbmciPg==

2/5单选题

难度：

2.若y=2x+1,且3y+x-10=0，则x=____.

A	2
B	1
C	3
D	4

正确答案：Qg==

5oqKeT0yeCsx5Luj5YWlM3kreC0xMD0w77yM5b6X77yaPGltZyB3aWR0aD0xODcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0YvM0IvckJBQ0oxVEprYi1TbElLTUFBQUMtV0R3Q0xRNzcxLnBuZyI+LOino+W+l++8mng9MQ==

3/5单选题

难度：

3.从方程组

中，求出x与y的关系是()

A	x+y=-1
B	x+y=1
C	x+y=9
D	x+y=-9

正确答案：Qw==

5pyJ4pGg77yM5b6X77yabT00LXgg4pGi77yb5oqK4pGi5Luj5YWl4pGh77yM5b6X77yaeS01PTQteC7mlbTnkIbvvIzlvpd5K3g9OQ==

4/5单选题

难度：

4.用代入法解方程组

时，以下各式中代入正确的是 ( )

A	3a=2×b+1
B	3a=2×b+1
C	3a=2×a+1
D	3a=2a×6a+1

正确答案：Qw==

55SxMmE9M2LvvIzlvpfvvJpiPTxpbWcgd2lkdGg9OSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zRi8zQi9yQkFDSjFUSmtjYXlwUVlsQUFBQk9kZXBIS0k4NzMucG5nIj5hLOaKimI9PGltZyB3aWR0aD05IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNGLzNCL3JCQUNKMVRKa2NheXBRWWxBQUFCT2RlcEhLSTg3My5wbmciPmHku6PlhaUzYT0yYisx77yM5b6XM2E9MsOXPGltZyB3aWR0aD0yOSBoZWlnaHQ9NDkgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zRS9GQS9yQkFDSmxUSmtjYWdWVUtMQUFBQmxNYVVOMGc4NzgucG5nIj5hKzHjgILmlYXpgIlD

5/5单选题

难度：

5.已知x+3y=0，则

的值为（）

A
B	-
C	3
D	-3

正确答案：Qg==

55SoeeihqOekungs5oiW55SoeOihqOekunnlnYflj6/vvIzkuKTnp43mlrnms5XjgILoi6XnlKjnlKh56KGo56S6eCzljbN4PS0zee+8jOaKing9LTN55Luj5YWlPGltZyB3aWR0aD04NSBoZWlnaHQ9NTUgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC83My83Mi9yQkFDRTFUSmtjbXlkdEtMQUFBRERqNnBnSEE2MDEucG5nIj7vvIzlvpfvvJrljp/lvI89PGltZyB3aWR0aD0xMDIgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRkEvckJBQ0psVEprY25qTUxfeUFBQUNuYlhvOVdVNzM5LnBuZyI+PS08aW1nIHdpZHRoPTExIGhlaWdodD02MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0ZBL3JCQUNKbFRKa2NtQlhIRnBBQUFCUzhVYnRWODc5OS5wbmciPjxicj4=