﹣（3x﹣2）+2（x﹣3）=（ ），（7x2﹣3x+2）﹣（ ）=5x2﹣x﹣5
﹣x﹣4，2x2﹣2x+7
6千米70米=______千米
0.5平方米=______平方分米
3元8角=______元
2.34千克=______千克______克．
Air quality in Beijing was rated as poor______ more than 5 million cars in the capital.
A．except for
B．regardless of
C．due to
D．in spite of
