(6.5-4.7)×2.75+0.9 简便运算.

问题描述:

(6.5-4.7)×2.75+0.9 简便运算.

(6.5-4.7)×2.75+0.9
=1.8×2.75+0.9
=0.9×2×2.75+0.9
=0.9×(5.5+1)
=0.9×6.5
=6.5×(1-0.1)
=6.5-0.65
=5.85