第1个回答 2020-04-30
(6.6+6.7+6.8)-(5.2+5.3+5.4)
=(6.6-5.2)+(6.7-5.3)+(6.8-5.4)
=1.4+1.4+1.4
=2.8+1.4
=4.2本回答被网友采纳
第2个回答 2020-04-30
6.6-5.2+6.7-5.3+6.8-5.4
=1.4+1.4+1.4
=1.4x3
=4.2
以上就是简便方法。
第3个回答 2020-04-30
(6.6+6.7+6.8)-(5.2+5.3+5.4)
=(6.6-5.2)+(6.7-5.3)+(6.8-5.4)
=1.4+1.4+1.4
=4.2
第4个回答 2020-04-30
(6.6+6.7+6.8)-(5.2+5.3+5.4)
=6.7×3-5.3×3
=(6.7-5.3)×3
=1.4×3
=4.2