问题:
下列各式,属于二元一次方程的个数有( )
①xy+2x-y=7;②4x+1=x-y;③
1
x
+y=5;④x=y;⑤x 2-y 2=2
⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y 2-y 2+x.
A.1
B.2
C.3
D.4
下列各式,属于二元一次方程的个数有( )
①xy+2x-y=7;②4x+1=x-y;③
+y=5;④x=y;⑤x 2-y 2=2
⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y 2-y 2+x.
①xy+2x-y=7;②4x+1=x-y;③
1 |
x |
⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y 2-y 2+x.
A.1 | B.2 | C.3 | D.4 |
参考答案: