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1、12.065.072.9430.349.7610.342333388325743441.71.250.81027.35.117+,3755437-71 9917713加法结合律,连减方法:a+b+c=a+(b+c),a+b-c=a+(b-c),a-b+c=a(b-c),a-b-c=a-(b+c);933-15.7-4.341.0619.7220.2873+8+225383847595322-911+7+3535乘法交换律,连除方法:abc=acbabc=a(bc),abc=a(bc),abc=a(bc),abc=a(bc),70014518.62.50.41.960.541.062.54171
2、7131313191929272712578a+(b+c)=a+b+ca+(b-c)=a+b-ca(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）7252631+(-)5-(-)1718 17787乘法结合律,连除方法.(ab)c=a(bc)a(bc)=abc,a(bc)=abc,a(bc)=abc,a(bc)=abc,1.25（8 0.5）0.25（4 1.2）1.25（2130.8）9.3(4(12+1007411311)0.74(71)24(-+)93100128632)77319516737（7-
3、）0.921.410.928.59-52038513 513991.311.61.61.311.618.49999+999+99+9554821-9983.212.5251.25883.60.257.60.253.50.1251.8991.83.89.90.382-7257731+3232771032525-1.019.61020.872.69.91222173333+363638 13.538 13.517335373727+13.572+13.51.57.4+0.6150%+25.3+2.725%0.6710.16.72821.62.8165.61.70.5683乘法分配律:(a+b)c=ac+bc(a-b)c=ac-bc隐“1”法.拆分法2314