59x28 28x42-28用简便方法计算

2025-04-14 00:28:40
推荐回答(2个)
回答(1):

59x28 +28x42-28
=(59+42-1)x28
=100x28
=2800

回答(2):

59×28+28×42-28
=28×(59+42-1)
=28×100
=2800