北师大版小学六年级数学简便运算练习题.pdf

12.065.072.9430.349.7610.34333 32574883441.71027.35.115791359,a+b+c=a+(b+c),a-b+c=a (b-c),933-15.7-4.31.25230.8173+43717-77a+b-c=a+(b-c),a-b-c=a-(b+c);41.0619.7220.28第 1 页 共 5 页73+8+2-233455588112+72+33355abc=a(bc),abc=a(bc),7001451.960.541717131919a+(b+c)=a+b+c799abc=a(bc),abc=a(bc)18.62.50.41.062.541313292727a+(b-c)=a+b-c第 2 页 共 5 页,a (b-c)=a-b+ca-(b+c)=a-b-c;19.68（2.682.97）5.68（5.394.32）19.68（2.979.68）7252+(-)56-(3178-7)a(bc)=abc,a(bc)=abc,1.25（8 0.5）1.25（2130.8）24(1112-38-16+13)0.921.410.928.591718 17a(bc)=abc,a(bc)=abc,0.25（4 1.2）9.3(410093)0.74(7174100)(12+27)7（73 1955-20）38165713-37513第 3 页 共 5 页1.311.61.61.39911.618.4559999+999+99+94821-9983.212.5257.60.257.6147.64。1.8991.8725103-7252-7251020.8773231+7321.25883.60.253.50.1253.89.90.381.019.62.69.9122217173+35第 4 页 共 5 页333336363838373713.513.527+13.572+13.5 1.57.4+0.6150%+25.3+2.725%0.6710.16.72821.62.8165.61.70.56831423第 5 页 共 5 页