单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,简便计算归类练习,苏教版五年级数学,明确四点：,A、一般情况下，四那么运算的计算顺序是：有括号时，先算 ，没有括号时，先算 ，再算 ，只有同一级运算时，从左往右 B、由于有的计算题具有它自身的特征，这时运用运算定律，可以使计算过程简单，同时又不容易出错C、注意，对于同一个计算题，用简便方法计算，与不用简便方法计算得到的结果应该相同我们可以用两种计算方法得到的结果比照，检验我们的计算是否正确a+b+c=,a+b-c=,a-b+c=,a-b-c=;abc=abc=,abc=abc=，,一、当一个计算题只有同一级运算只有乘除或只有加减运算又没有括号时，我们可以 带符号搬家,a+c+b,a-c+b,a+c-b,a-c-b,acb,acb,acb,acb,12.065.072.94,30.349.7610.34,0.2574,1141.1,1.250.60.8,77 37.7,=(12.06+2.94)+5.07,=(30.34-10.34)+9.76,=(12.37-2.37)-1.432,=(0.254)7,=111.14,=1.250.80.6,=777.7 3,二、1运用加法结合律进行简算(ab)c=a(bc)2运用乘法结合律进行简算：,这种题型往往含特殊数字之间相乘(ab)c=a(bc),特殊数字之间相乘：,254=100 1258=1000,5.7613.674.246.33,1252460.8,=5.764.24(13.676.33),=1010,=20,=1250.8246,=100246,=24600,三、利用乘法分配律进行简算:,(ab)c=ac bc,(ab)c=ac bc,ac bc=(ab)c,ac bc=(ab)c,做这种题,一定不要急着去算,先要分析各数字之间的特殊关系。
也就是先要仔细观察，找到做题的窍门2.512.5)40,3.684.796.324.79,26.8625.6616.8625.66,5.7995.7,=2.54012.540,=100500,=600,=(3.686.32)4.79,=104.79,=47.9,=(26.8616.86)25.66,=1025.66,=256.6,=5.7(991),=5.7100,=570,四、利用加减乘除把数拆分后再利用乘法分配律进行简算：,349.9,571.01,7.81.1,1250.72,=34(100.1),=3410340.1,=3403.4,=336.6,=57(10.01,),=571570.01,=57+0.57,=57.57,=7.8(10.1),=7.817.80.1,=7.80.78,=8.58,=12580.09,=10000.09,=90,五、连减与连除,abc=a(bc)abc=a(bc),a(bc)=abc,a(bc)=a bc,56.53.76.3,32.60.42.5,4.51.8,4.23.5,=56.5(3.76.3),=56.510,=46.5,=32.6(0.42.5),=32.61,=32.6,六、需要变形才能进行的简便运算:做这一类题，要先观察，找出规律，然后变形后进行简算。
a+b)c=ac+bc,ac+bc=(a+b)c,ab+c不等于ab+ac,86.70.3561.333.56,15.645.6 0.25,=15.645.64,=(15.65.6)4,=104,=2.5,=8.673.561.333.56,=(8.561.33)3.56,=103.56,=35.6,2.35+1.713+0.287+7.65,1.57+0.245+7.43,6.02+3.6+1.98,0.134+2.66+0.866,1.27+3.9+0.73+16.1,7.54.96.5,3.070.381.62,1.293.72.716.3,82.451.55,3.251.790.791.75,23.40.813.47.2,0.32403,3.20.364.81.64,1.233.40.236.6,0.2536,12.73.70.84,36.541.764.54,0.250.734,7.60.80.27.6,0.85199,0.258.54,1.288.60.728.6,12.50.960.8,10.49.60.35,0.84.31.25,3.123.1299,28.610128.6,4.236.170.8,0.8615.70.8614.7,2.4102,147.322.68,2.648.677.3611.33,2.311.20.5,2.50.250.4,9.161.50.59.16,3.63.60.5,4.51.8,4.23.5,9300.65,63.42.50.4,4.91.4,3.91.35,2.52.4,2.745,150.25,0.351.2520.8,32.40.90.132.4,7028,150.150.4,。