99.9*99.9如何简便运算
来源：学生作业帮助网 编辑：六六作业网 时间：2025/02/07 17:34:57
99.9*99.9如何简便运算99.9*99.9如何简便运算99.9*99.9如何简便运算=(100-0.1)*99.9=100*99.9-0.1*99.9=9990-9.99=9980.01(100
99.9*99.9如何简便运算
99.9*99.9如何简便运算
99.9*99.9如何简便运算
=(100-0.1)*99.9
=100*99.9-0.1*99.9
=9990-9.99
=9980.01
(100-0.1)×（100-0.1）展开=10000-10-10+0.01=9980.01 望采纳
(100-0.1)^2=10000-0.2*100+0.01=9980.01
99.9*99.9
=99.9^2
=(100-0.1)^2
=100^2-2*100*0.1+0.1^2
=9980.01
=(100-0.1)*99.9
=100*99.9-0.1*99.9
=9990-9.99
=9980.01