如题所述
第1个回答 2022-12-03
15×199
=15x(200-1)
=15x200-15x1
=3000-15
=2975
=15x(200-1)
=15x200-15x1
=3000-15
=2975
第2个回答 2022-12-03
15×199
=15x(200-1)
=15x200-15x1
=3000-15
=2975
=15x(200-1)
=15x200-15x1
=3000-15
=2975
第3个回答 2022-12-03
15×199
=15x(200-1)
=15x200-15x1
=3000-15
=2985
=15x(200-1)
=15x200-15x1
=3000-15
=2985
第4个回答 2022-12-03
你好，具体解法如下：
15×199
=15×(200-1)
=15×200-15×1
=3000-15
=2985
15×199
=15×(200-1)
=15×200-15×1
=3000-15
=2985
