如题所述
0.4×99-0.4
=39.6-0.4
=39.2
=39.6-0.4
=39.2
温馨提示:答案为网友推荐,仅供参考
第1个回答 2019-12-08
0.4×99-0.4
=0.4×(100-1)-0.4
=0.4×(100-1-1)
=0.4×(100-2)
=0.4×100-0.4x2
=40-0.8
=39.2本回答被网友采纳
=0.4×(100-1)-0.4
=0.4×(100-1-1)
=0.4×(100-2)
=0.4×100-0.4x2
=40-0.8
=39.2本回答被网友采纳
第2个回答 2019-12-08
0.4×99-0.4
=0.4×(100-1)-0.4
=40-0.4-0.4
=39.2
=0.4×(100-1)-0.4
=40-0.4-0.4
=39.2
第3个回答 2019-12-08
0.4×99-0.4
=0.4×(99-1)
=0.4×(100-2)
=0.4×100-0.4×2
=40-0.8
=39.2
=0.4×(99-1)
=0.4×(100-2)
=0.4×100-0.4×2
=40-0.8
=39.2
第4个回答 2019-12-08
0.4*(100-2)
=40-0.8
=39.2
=40-0.8
=39.2