如题所述
第1个回答 2021-06-28
42×102-82
=42×(100+2)-82
=42×100+42×2-82
=4200+84-82
=4200+(84-82)
=4200+2
=4202
=42×(100+2)-82
=42×100+42×2-82
=4200+84-82
=4200+(84-82)
=4200+2
=4202
第2个回答 2021-06-28
42×102-82
=42×102-42×2
=42×(102-2)
=42×100
=4200
=42×102-42×2
=42×(102-2)
=42×100
=4200
第3个回答 2021-06-28
42×102-82=42×(100+2)-82
=4200+84-82
=4202
=4200+84-82
=4202
第4个回答 2021-06-28
=42×(100+2)-82=4200+84-82=4202
第5个回答 2021-06-28
42×102-82
=42×100+42×2-82
=4200+84-82
=4200+2
=4202
=42×100+42×2-82
=4200+84-82
=4200+2
=4202