解:(1)原式=1+2×﹣3 =1+3﹣3=1;(2)原式=4x2﹣9﹣4x2+4x+x2﹣4x+4 =x2﹣5. 当x=﹣时,原式=(﹣)2﹣5=3﹣5=﹣2.
超级试练试题库
© 2017-2019 超级试练试题库,All Rights Reserved.