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.
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.