四年级下册数学小数加减法简便运算★在计算中运用，使其能够简便计算的关键在于。加法交换律：加法结合律：整数减法的运算性质：①②加法结合律：5.3+(17.13-4.7)+0.870.57+13.36+1.43+6.64.14.15-4.75+1.85-2.2514.7+5.9-14.7+5.9减法运算性质：58.92-15.5-18.92-4.518.917-(4.917+5.73)1.29-3.7+9.71-6.380-12.4-7.62.8×101-2.80.25×4.4300-2730÷91-70125×48568-(68+178)6.78+2.04+7.22+5.96400-(1300÷65+35)6.45-(2.31-1.55)8.49+(4.64-2.14)×0.6464×39+37×39-3923.4-8.54-1.46101×78-782.88+2.3+4.71050÷15÷74.2×99+4.2103×87-93×876.92-(3.2+1.92)5.02-3.5+0.9825.86+7.8-5.863.2+6.8×1.25×816.8÷0.5÷23.27+5.49-1.27+4.510.8×3.37×12.510-2.8-7.27.5-7.5×0.92.5×444.8×1029.16×1.53-0.053×91.64.5+4.5×998.08×1.256.74+12.62+24.38+3.263.7×0.25×49.75-(6.75+0.4)6.78+2.04+7.22+5.962.6×992.43×45+24.3×5.50.25×4.42.8×101-2.81.29-3.7+9.71-6.36.45-(2.31-1.55)23.4-8.54-1.466.92-(3.2+1.92)5.02-3.5+0.9825×1.25×3225.86+7.8-5.860.8×3.37×12.54.2×99+4.24.25÷2.5×101-1.7103×4.55.6×0.8×12.50.56×101-0.56(2.56-1.18)÷2.3×1.54×9.04×2.580-12.4-7.6