Question

5.8x9.9x0.58如何简便运算

Answer 1

5.8*9.9*0.58
=5.8*5.8*0.99
=(6-0.2)*(6-0.2)*(1-0.01)
=(36-2.4+0.04)(1-0.01)
=33.64*(1-0.01)
=33.64-0.3364
=33.3036