简便级算用 第等式计算

问题描述:

简便级算用 第等式计算
(374-265+238)×6
(72+108÷26)×64
简便计算
用第等式计算

(374-265+238)×6
= (350+ 24 - 265 + 238)×6 ←(这一步可省)
= (350 - 265 + 262)×6
= (350 - 3)×6
= 350×6 - 3×6 ←(这一步可省)
= 2100 -18
= 2082
(72+108÷26) ×64
= (72 + 54÷13) ×64
= (72 + 4 + 2÷13) ×64 ←(这一步可省)
= (75 + 15÷13) ×64
= (15 + 3÷13) ×5 ×64 ←(这一步可省)
= (3×5) ×320 + (3÷13) ×320
= 3×1600 + 10× (96÷13) ←(这一步可省)
= 4800 + 10× (7 + 5/13)
= 4800 + 70 + 50/13
= 4870 + 3 + 11/13
= 4873 又 11/13