四年级下册数学《小数简便计算》专项练习

四年级下册数学《小数简便计算》专项练习


简介:
19.826-1.173-5.248-3.405 =19.826-(1.173+5.248+3.405) =19.826-9.826 =10 27.64-(5.79+1.64) =27.64-1.64 -5.79 =26-5.79 =20.21 0.25×4.78×4 =0.25×4×4.78 =1×4.78 =4.78 0.98×2.5 =(1-0.02)×2.5 =1×2.5-0.02×2.5 =2.5-0.05 =2.45