简便运算:9.9^2+9.9*2+0.01
问题描述:
简便运算:9.9^2+9.9*2+0.01
答
9.9^2+0.99*2+0.01
=9.9²+2x0.1x9.9+0.1²
=(9.9+0.1)²
=10²
=100