Question

77×42+77×57+77怎么递等试简便计算？

Answer 1

简便计算
77*42+77*57+77
=77*（42+57+1）
=77*100
=7700

Answer 2

77×42+77×57+77
=77×(42+57+1)
=77×100
=7700

Answer 3

=77*（42+57+1)
=77*100
=7700