问题 解答题 口算:2005-1998=1.6×0.05=5.7÷0.19=0.125×0.7=58÷23=23÷6=2185÷3534=40×1639=12÷13=34×12=1738×1951=725×201-725= 答案 2005-1998=7,1.6×0.05=0.08,5.7÷0.19=30,0.125×0.7=0.0875,58÷23=1516,23÷6=19,2185÷3534=625,40×1639=161639,12÷13=32,34×12=9,1738×1951=16,725×201-725=56.