❶ 56X51十56X49怎樣簡便計算
56X51十碼枯塌遲圓敗野56X49
=56*(51+49)
=56*100
=5600
❷ 56十56x49簡便方法計算
56+56x49=56x（49+1）=56x50=56x100/2=5600/2=2800
❸ 56十56x49簡便方法計算
56+56*49=（49+1）*56=50*56=2800