Question

98.7×99+98.8简便方法？

Answer 1

简便计算
98.7*99+98.8
=98.7*（99+1）-0.2*98.7
=98.7*100-19.74
=9870-19.74
=9850.26

Answer 2

98.7×99+98.8
=98.7×99+（98.7+0.1）
=98.7×99+98.7×1+0.1
=（98.7×99+98.7×1）+0.1
=98.7×（99+1）+0.1
=98.7×100+0.1
=9870+0.1
=9870.1