四下数学小数加减法简便计算

四下数学小数加减法简便计算


简介:
70.8-1.25-1.75 =70.8-(1.25+1.75) =70.8-3 =67.8 4.1+24.65+5.9 =4.1+5.9+24.65 =10+24.65 =34.65 0.96-0.28+0.04-0.72 =0.96+0.14-(0.28+0.72) =1-1 =0 18.7-6.8-3.2 =18.7-(6.8+3.2) =18.7-10 =8.7