369+599和3.8x98+7.6怎么简算

问题描述:

369+599和3.8x98+7.6怎么简算

369+599
=370-1+600-1
=370+600-2
=968
3.8x98+7.6
=3.8×98+3.8×2
=3.8×(98+2)
=3.8×100
=380