三年级数学下册练习脱式计算题300道题

三年级数学下册练习脱式计算题300道题脱式计算，也叫递等式计算，是小学数学学习中的重要环节。它不仅能帮助同学们巩固加减乘除的基本运算能力，更能培养大家清晰的逻辑思维和规范的书写习惯。在三年级下册，我们主要学习的是不含括号和含有小括号的两步及简单三步混合运算。通过大量有针对性的练习，同学们可以更好地掌握运算顺序，提高计算的准确性和速度。下面，我们就为大家精心准备了300道脱式计算题，希望同学们能认真完成，逐步提升自己的计算技能。一、脱式计算运算规则回顾在开始练习之前，我们先来回顾一下脱式计算的基本运算规则，这是保证计算正确的前提：1.同级运算（只有加减或只有乘除）：从左往右依次计算。2.不同级运算（既有加减又有乘除）：要先算乘除，后算加减。3.带小括号的运算：要先算小括号里面的，再算小括号外面的。同学们在计算时，一定要严格按照这些规则进行，每一步计算的结果都要写清楚，养成良好的书写习惯。二、三年级数学下册脱式计算题练习（共300道）（一）只有加减的混合运算（75道）1.56+23+172.89-34-253.45+38-264.90-54+375.28+62+156.100-67-237.36+47-588.72-28+449.19+56+2510.88-49-1811.53+29-3512.64-36+2913.27+37+2614.95-46-3515.48+36-5716.80-29+3617.33+48+1918.76-28-3219.59+25-4420.68-43+2721.22+58+1622.91-55-2723.41+39-5224.70-33+4525.38+42+1126.85-47-2827.57+26-3828.66-29+3429.29+53+1830.93-58-2531.44+37-5132.74-38+2933.31+49+1234.82-45-2635.52+28-3936.69-32+3537.35+43+1738.87-49-2339.55+27-4140.71-35+3041.26+55+1942.94-60-2443.49+33-5644.65-27+3845.30+50+2046.88-40-3847.51+29-3748.73-31+2849.32+46+2250.89-53-2751.47+35-4852.67-28+3953.24+57+1954.92-56-2555.50+30-4056.75-36+2957.37+44+1958.83-45-2859.54+26-3560.63-29+4161.23+59+1862.90-52-2863.42+38-5464.76-39+2765.34+45+2166.81-44-2767.53+27-3668.68-30+3569.25+56+1970.86-51-2571.46+34-5072.77-38+2973.39+41+2074.84-46-2875.58+24-39（二）只有乘除的混合运算（75道）1.8×3÷62.72÷8×53.6×6÷44.45÷9×75.9×2×56.64÷8÷27.5×8÷48.36÷6×99.7×4×210.48÷6÷411.8×6÷312.54÷9×813.3×9×314.72÷9÷215.6×7÷316.42÷7×617.8×5×218.56÷7÷419.9×4÷620.32÷4×721.4×8×222.63÷7÷323.7×6÷224.27÷3×525.5×9×226.40÷5÷427.8×7÷428.54÷6×429.6×3×430.35÷5÷731.9×5÷332.48÷8×333.7×8×134.54÷6÷335.4×9÷636.63÷9×437.8×2×638.24÷3÷239.5×7÷540.49÷7×841.6×8×242.36÷4÷343.9×3÷944.56÷8×345.3×8×446.64÷8÷447.7×5÷748.28÷4×949.5×6×350.45÷5÷351.8×9÷652.63÷7×553.4×7×354.56÷8÷755.9×6÷256.30÷5×757.6×5×258.21÷3÷759.8×4÷260.48÷6×561.7×3×562.32÷4÷863.9×8÷464.54÷9×365.5×5×466.42÷7÷367.8×8÷268.63÷9×669.3×6×570.56÷7÷271.7×9÷372.36÷6×873.4×4×574.72÷8÷375.9×7÷7（三）既有加减又有乘除的混合运算（75道）1.5+3×62.30-18÷23.7×8-204.45+36÷95.60-4×76.24+54÷67.9×3+258.64-42÷79.8+6×510.48-32÷411.6×7+1512.50+45÷913.72-8×814.33+63÷715.5×9-2616.63-54÷617.12+8×418.70-6×919.9×5+3720.49+24÷321.81-7×922.28+40÷523.4×6-1724.56-35÷725.18+9×326.80-5×827.7×4+3928.36+56÷829.90-6×630.40+27÷331.8×8-4532.55-48÷633.25+3×734.66-9×735.6×9+1236.21+63÷937.75-8×538.39+42÷739.5×7-1940.54-27÷341.30+4×842.68-7×743.8×6+2944.44+32÷445.92-9×946.35+54÷647.7×3-1148.60-40÷549.22+5×650.77-8×851.9×4+3652.52+18÷253.85-6×554.48+35÷755.3×8-1656.69-63÷957.16+7×558.88-9×959.6×8+2260.31+48÷661.76-5×662.51+28÷463.8×5-2864.73-36÷465.29+6×466.90-7×867.5×5+4568.38+64÷869.83-4×970.57+27÷371.9×2-1072.65-56÷773.24+9×574.79-3×975.4×9+28（四）带小括号的混合运算（75道）1.(15+25)÷82.7×(36÷6)3.(42-18)÷44.63÷(12-3)5.(8+16)×26.45÷(3×3)7.(50-26)÷68.8×(4+5)9.(27+36)÷910.56÷(14-7)11.(90-45)÷512.9×(8-3)13.(12+24)÷614.64÷(2×4)15.(72-54)÷216.5×(9+3)17.(33+27)÷518.48÷(11-5)19.(60-32)÷720.6×(7-2)21.(18+36)÷922.72÷(3×3)23.(49-14)÷524.8×(