1.99的平方减2.99乘0.99

分类: 作业答案 • 2021-12-20 03:57:43

问题描述：

1.99的平方减2.99乘0.99

答

1.99²-2.99×0.99
=1.99²-(1.99+1)(1.99-1)
=1.99²-(1.99²-1)
=1.99²-1.99²+1
=1

答

1.99*1.99-2.99*.99=1

答

原式=1.99²-(1.99+1)×(1.99-1)
=1.99²-(1.99²-1²)
=1.99²-1.99²+1
=1