用简便方法计算:7.74×(2.8-1.3)+1.5×2.26.

问题描述:

用简便方法计算:7.74×(2.8-1.3)+1.5×2.26.

7.74×(2.8-1.3)+1.5×2.26
=7.74×1.5+1.5×2.26
=(7.74+2.26)×1.5
=10×1.5
=15.