问题
计算题
化简：
（1） 5m﹣7n﹣8p+5n﹣9m﹣p
（2）（5x2y﹣7xy2）﹣（xy2﹣3x2y）
答案
解：（1）5m﹣7n﹣8p+5n﹣9m﹣p
=（5﹣9）m+（﹣7+5）n+（﹣8﹣1）p
=﹣4m﹣2n﹣9p；
（2）（5x2y﹣7xy2）﹣（xy2﹣3x2y）
=5x2y﹣7xy2﹣xy2+3x2y
=8x2y﹣8xy2．
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化简：
（1） 5m﹣7n﹣8p+5n﹣9m﹣p
（2）（5x2y﹣7xy2）﹣（xy2﹣3x2y）
解：（1）5m﹣7n﹣8p+5n﹣9m﹣p
=（5﹣9）m+（﹣7+5）n+（﹣8﹣1）p
=﹣4m﹣2n﹣9p；
（2）（5x2y﹣7xy2）﹣（xy2﹣3x2y）
=5x2y﹣7xy2﹣xy2+3x2y
=8x2y﹣8xy2．
| 完形填空。 |
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( )1. A. came | B. moved B. thoughts B. how B. kind B. care B. so B. tell B. love B. brought B. comes | C. lived C. points C. when C. clever C. talk C. when C. understand C. meet C. finished C. stops | D. liked D. feelings D. who D. perfect D. complain D. if D. listen D. think D. got D. goes |
＝1、A•