77×98
=77×（100-2）
=77×100-77×2
=7700-154
=7546简便运算：77×103=77×（100+3）
=77000+231
=77231简便运算：77×98＋154=77×98+154
=77×（100-2）+154
=77×100-77×2
=7700-154+154
=7546+154
=7700最佳答案：77×98＋154=77×98＋2×77=77×（98＋2）=77×100=7700你的答案太复杂了、太多了哦，谢谢