80道脱式计算 答案过程.docx

1、80道脱式计算 答案过程1.25（8+10） =1.258+1.2510 =10+12.5=22.5 9123-（123+8.8） =9123-123-8.8 =9000-8.8 =8991.2 1.248.3+8.31.76 =8.3（1.24+1.76) =8.33=24.9 99991001 =9999（1000+1） =99991000+99991 =10008999 14.86.3-6.36.58.33.7 =（14.8-6.5）6.38.33.7 =8.36.3+8.33.7 8.3（6.33.7） =8.310 =83 1.24+0.78+8.76 =（1.24+8.76）+0.

2、78 =10+0.78 =10.78 933-157-43 =933-（157+43） =933-200 =733 4821-998 =4821-1000+2 =3823 I3212525 =4812525 =（425）（8125） =1001000 =100000 9048268 =（2600+2600+2600+1248）26 =260026+260026+260026+1248269 =100+100+100+48 =348 2881 43 =（1290+1591） 434 =129043+159143 =30+37 3.242.33.75-12.50.42316 =3.242.33.7

3、5-1.2542.31.6 =42.3(3.23.75-1.251.6) =42.3(40.83.75-1.2540.4) =42.3(40.423.75-1.2540.4) =42.3(4x0.4x7.5-1.25x4x0.4) =42.340.4(7.5-1.25) =42.340.46.25 =42.3(42.5) =4237 1.8+181.5-0.50.3 =1.8+12-0.15 =13.8-0.15 =13.65 6.58+3.58-47 =52+28-47 =80-47 (80-9.8)5分之2-1.32 =70.2X2/5-1.32 =28.08-1.32 =26.76 87

4、分之41(3.2-2.95) =84/710.25 =84/74 =8/7 2700（506499）900 =27007900 =18900900 =21 33.02（148.490.85）2.5 =33.0257.552.5 =33.0223.02 =10 （111）5.1 =（11）5.1 =05.1 =0 18.1（30.2990.23）1 =18.11.71 =18.11.7 =19.8 -18+29+-52+60= 19 -3+-2+-1+0+1+2= -3 -301+125+301+-75= 50 -1+-1/2+3/4+-1/4= -1 -7/2+5/6+-0.5+4/5+19/

5、6= 1.25 -26.54+-6.14+18.54+6.14= -8 1.125+-17/5+-1/8+-0.6= -3 0.452.51.125 0.81.251 0.33.61.08 0.30.30.09 100.07 0.7 0.920.4 0.368 0.20.260.052 0.1440.56 0.020.10.002 1.20.3 0.362.50.41 2.4512 0.224 0.88 3.2500 0.90.52 0.38 3.9913.99 03.52 0 12.58100 810 = 0.8 10-1.8-7.2= 1 0.43+3.57= 4 2.5412=144 0

6、.90.8= 0.72 7.5x-3x = 4.5x a+3a+7a= 11a 1.05100= 105 10.5= 2 0.963= 0.32 0.56100= 56 3.78100= 378 40.8 =5 3.215100= 321.5 0.810= 8 4.08100= 408 1.10.2 =0.22 0.60.8 = 0.48 30.9= 2.7 2.50.4= 1 0.165 0.8 1.782.2 = 3.98 1.20.5-0.4 = 0.2 0.70.01 = 70 2.50.4 = 1 123.9= 8.1 1.2581.25 = 8 6.60.66 = 10 5.370

7、+4.63 =4.63 3.92.03 5.93 7.22.810 1.45= 7 3/5+(-2/3) =9/15+(-10/15) =-(10/15 -9/15) =-1/15 1/2+(-2/3)+4/5+(-1/2)+(-1/3) =1/2+(-1/2)+(-2/3)+(-1/3)+4/5 =0+(-1)+4/5 =-1/5 13/17-3.5-6+2.5+6+4/17 =(13/17+4/17+(-3.5)+2.5+-6+6 =1+(-1)+0 =0 (-3.8)+2.7+(-0.43)+1.3+(-0.2) =(-3.8)+(-0.2)+2.7+1.3+(-0.43) =(-4)+

8、4+(-0.43) =-0.43 5/6+(-3/4) =10/12+(-9/12) =10/12-9/12 =1/12 (-57/8)+2.125+(-3.37)+(-2.63)+25/4+(-0.25) =(-7.125)+2.125-6+6.25-0.25 =(-5)+(-6)+6 =-5 (-32)-(+5) =(-32)+(-5) =-37 7.3-(-6.8) =7.3+(+6.8) =14.1 (-1/50-(-2/3)-(+0.48)-(+4/9) =(-1/50)+(+2/3)+(-0.48)+(-4/9) =-1/50+2/3-0.48-4/9 =-1/50-0.48+2/

9、3-4/9 =(-0.02-0.48)+(6/9-4/9) =-5/18 (-2)-(-25) =(-2)+(+25) =23 1/2*(-1/4) =-(1/2*1/4) =-1/8 (-1/2）*（-3/4） =+（1/2*3/4）=3/8 (-3)*5/6*(-3/5)*(-9/4)=-3*5/6*3*5*9/4=-27/8(-0.25)*0.5*(-100)*4=(-4*0.25)*0.5*(-100)=-1*(-50)=50(-5)*10/3+2*10/3+(-6)*10/3=(-5+2-6)*10/3=-9*(3+1/3)=-27-3=-30-13*2/3-0.34*2/7+1/3

10、*(-13)-5/7*0.34=-13*2/3+1/3*(-13)+(-0.34*2/7-5/7*0.34)=-13*(2/3+1/3)+0.34*(-2/7-5/7)=-13-0.34=-13.34(-3)（-7/4）*0.75*7/33=-3*（-4/7）*3/4*7/3*1/3=3*4/7*3/4*7/3*1/3=1 -3-【-5+（1-0.2*3/5）（-2）】 =-3-5+(1-3/25)（-2） =-3-5+22/25*(-1/2) =-3-(-5-11/25) =-3+5又11/25=2又11/25 15（1/5-1/3） =15（-2/15） =-15*15/2 =-225/2（-5/6）（-2/3）*（-3/2） =（-5/6）*（-3/2）*（-3/2） =-5/6*3/2*3/2 =-15/8 （注：文档可能无法思考全面，请浏览后下载，供参考。可复制、编制，期待你的好评与关注）