28*30-28*11+28怎么简算
问题描述:
28*30-28*11+28怎么简算
答
28*30-28*11+28
=28×﹙30-11+1)
=28×20
=560
答
28*30-28*11+28
=28*(30-11+1)
=28*20
=560
答
28*30-28*11+28
=28*(30-11+1)
=28*20
=560
答
28*30-28*11+28
=28(30-11+1)
=28x20
=560
答
=28*(30-11+1)
=28*20
=560