原式
=4.4-1.6-1.4
=4.4-(1.6+1.4)
=4.4-3
=1.4
先把1又2/5化为小数1.4 ,
再把-1.6-1.4看成-(1.6+1.4),这样计算就简便。
解:4.4-1.6-1又2/5
=4.4-1.6-1.4
=4.4-(1.6+1.4)
=4.4-3
=1.4
4.4-1.6-1又2/5
=4.4-1.6-1.4
=4.4-(1.6+1.4)
=4.4-3
=1.4
4.4-1.6-1又2/5
=4.4-1又2/5-1.6
=(4.4-1.4)-1.6
=3-1.6
=1.4