80道脱式计算答案过程

1、1.25X (8+10)=1.25X8+1.25X10=10+12.5=22.59123- (123+8.8)=9123-123-8.8=9000-8.8=8991.21.24X83+8.3X1.76=8.3 X (1.24+1.76) =8.3X3=24.99999X1001=9999 X (1000+1)=9999X1000+9999X1=1000899914.8X6.3-6.3X6.5 + 8.3X3.7=(14.8-6.5) X6.3 + &3X3.7=8.3X63+8.3X3.78.3X (63 + 3.7)=8.3X10=831.24+0.78+8.76=(1.24+8.7

2、6) +0.78=10+0.78=10.78933-157-43=933- (157+43)=933-200=7334821-998=4821-1000+2=3823132X125X25=4X8X125X25=(4X25) X (8X125)=100X1000=10000090484-268=(2600十2600+2600+1248) 4-26=2600 -r 26+2600 一 26+2600 一 26+1248 269=100+100+100+48=34828814- 43=(1290+1591)十 434=129043+1591 一 43=30+373.2 X 42.3 X 3.75-1

3、2.5 X 0.423 X 16 =3.2 X 42.3 X 3.75-1.25X423 X 1.6 =42.3X(3.2X3.75-1.25X1.6) =42.3 X (4 X 0.8 X 3.75-1.25 X 4 X 0.4) =42.3 X(4X0.4X2X 3.75-1.25 X4X 0.4) =42.3 X (4x0.4x7.5-1.25x4x0.4) =42.3 X 4 X 0.4 X (7.5-1.25) =42.3 X 4X0.4X6.25 =423X(4X2.5)=42371.8+184-1.5-0.5X0.3 =1.8+12-0.15=13.8-0.15=13.656.5

4、X8+3.5X8-47 =52+28-47=80-47(80-9.8) X 5 分之 2-1.32 =70.2X2/5-132=28.08-1.32=26.768X7 分之 44-14-(3.2-2.95) =8X4/74-(14-0.25=8X4/74-4=8/72700X (506-499) 4-900=2700X74-900=18900-r 900=2133.02- (148.4-90.85) 4-2.5=33.02-57.554-2.5=33.02-23.02=10(1-rl-l) 4-5.1=(1-1) 4-5.1=04-5.1=018.1+ (3-0.299-rO.23) XI=1

5、8.1 + 1.7X1=18.1 + 1.7=19.8-18+29+-52J+60=19-3+-2+-l+0+l+2=-3301+125+301+卜 75=50-l+-l/2+3/4+-1/4=-l-7/2J+5/6+-0.习+4/5+19/6=1.25-26.54+-6.14+18.54+6.14=81.125+-17/5+-l/8+-0.6=.q0.8X1.25 = 10.3X3.6=1.080.3x0.3=0.0910x0.07= 0.70.92X0.4= 0.3680.2X0.26=0.0520.14X4=0.560.02X0.1=0.0021.2X03= 0.362.5X04=10.

6、22X4= 0.883.25X0=00.9-0.52= 0.383.99X1=3.990X3.52=012.5X8=10084-10 二 0.810-1.8-7.2= 10.43+3.57=42.5X4X12=144a+3a+7a = = 11a1.05X100= 10514-0.5= 20.964-3= 0.320.56X100= 563.78X100= 37844-0.8 二53.215X100= 321.50.8X10=84.08X100=40811X0.2 =0.220.6 X 0.8 = 0.483X0.9 二 2.72.5 x 0.4=10.16X5 = 0.81.78+2.2 二

7、 3.981.2X0.5-0.4 二 0.20.74-0.01 = 702.5 X 0.4 二 112-3.9=8.16.64-0.66 = 105.37X0+4.63 =4.633.9 + 2.03= 5.937.2+2.8 = 101.4X5= 73/5+(-2/3)=9/15+(-10/15)=-(10/15 -9/15)=-1/151/2+(-2/3)+4/5+(-1/2)+(-1/3)= 1/2+(-1/2) + (-2/3)+(-1/3)+4/5=0+(-1)+4/5=-1/513/17-3.5-6+2.5+6+4/17=(13/17+4/17+(-3.5)+2.5+-6+6=1+

8、(-1)+0=0(-3.8)+2.7+(-0.43)+1.3+(-0.2)=K-3.8)+(-0.2)+2.7+1.3+(-0.43)=(-4)+4+(-0.43)=-0.435/6+(-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)=-377.3-(-6.8)二 7.3+(+6.8)=14.1(-1/50-(-2/3)-(+0.48)-(+4/9)=(-1/50)

9、+(+2/3)+(-0.48)+(-4/9)=-1/50+2/3-0.48-4/9=-1/50-0.48+2/3-4/9二(-0.02-048)+(6/9-4/9)=-5/18(-2)(25)二(叨+(+25)=231/2*(-1/4)=-(1/2*1/4)=-1/8(-1/2) * (-3/4)二 + (1/2*3/4)=3/8(-3)*5/6*(-3/5)*(-9/4)=-3*5/6*3*5*9/4二-27/8(-0.25)*0.5*(-100)*4=(-4*0.25)*0.5*(-100)=-1*(-50)二 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*(-13)-5/7*0.34 二-13*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)4- (-7/4) *0.75*7/34-3=-3* (-4/7) *3/4*7/3*1/3=3*4/7*3/4*7/3*1/3二 1-3-【-5+ (1-0.2*3/5) 4- (-2)=-3-5+(1-3/25)4- (-2)=-3-5+22/