来自苏为州的问题
用简便方法计算.①5.38-(1.5+2.38)②5.68×99+5.68③126×98+126+63×2④44×(511-14)
用简便方法计算.
①5.38-(1.5+2.38)
②5.68×99+5.68
③126×98+126+63×2
④44×(511-14)
1回答
2020-12-01 01:34
用简便方法计算.①5.38-(1.5+2.38)②5.68×99+5.68③126×98+126+63×2④44×(511-14)
用简便方法计算.
①5.38-(1.5+2.38)
②5.68×99+5.68
③126×98+126+63×2
④44×(511-14)
①5.38-(1.5+2.38),=5.38-1.5-2.38,=(5.38-2.38)-1.5,=3-1.5,=1.5;②5.68×99+5.68,=(99+1)×5.68,=100×5.68,=568;③126×98+126+63×2,=126×98+126+126,=(98+1+1)×126,=100×126,=12600;...