450加11乘以42减42的简便算法

2024-12-03 12:51:51
推荐回答(2个)
回答1:

450+11×42-42
=450+42×(11-1)
=450-420
=30

回答2:

450+11x42-42
=450+(11-1)x42
=450+10x42
=450+420
=870