28*30-28*11+28怎么简算
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28*30-28*11+28怎么简算
28*30-28*11+28怎么简算
28*30-28*11+28怎么简算
=28*(30-11+1)
=28*20
=560
28*30-28*11+28
=28(30-11+1)
=28x20
=560
28*30-28*11+28
=28×﹙30-11+1)
=28×20
=560
28*30-28*11+28
=28*(30-11+1)
=28*20
=560
28*30-28*11+28
=28*(30-11+1)
=28*20
=560