解:原式=×(﹣60)﹣
×(﹣60)﹣
×(﹣60)
=﹣40﹣﹣5﹣(﹣4)
=﹣40+5+4
=﹣31;
(2)解:原式=1+9×﹣(﹣64)÷(﹣32)
=1+﹣2
=;
(3)解:原式=5x2y﹣7xy2﹣xy2﹣3x2y
=8x2y﹣8xy2;
(4)解:原式=﹣9a2﹣6a﹣(a2﹣10a+8a2﹣2﹣3a)
=﹣9a2﹣6a﹣(9a2﹣13a﹣2)
=﹣9a2﹣6a﹣9a2+13a+2
=﹣18a2+7a+2.
© 2017-2019 超级试练试题库,All Rights Reserved.