80道脫式計算 答案過程參考模板

1、1.25×（8+10） =1.25×8+1.25×10 =10+12.5=22.5 9123-（123+8.8） =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×（1.24+1.76) =8.3×3=24.9 9999×1001 =9999×（1000+1） =9999×1000+9999×1 =10008999 14.8×6.3-6.3×6.58.3×3.7 =（14.8-6.5）×

2、6.38.3×3.7 =8.3×6.3+8.3×3.7 8.3×（6.33.7） =8.3×10 =83 1.24+0.78+8.76 =（1.24+8.76）+0.78 =10+0.78 =10.78 933-157-43 =933-（157+43） =933-200 =733 4821-998 =4821-1000+2 =3823 I32×125×25 =4×8×125×25 =（4×25）×（8×125） =100×1000 1 / 13=10000

3、0 9048÷268 =（2600+2600+2600+1248）÷26 =2600÷26+2600÷26+2600÷26+1248÷269 =100+100+100+48 =348 2881÷ 43 =（1290+1591）÷ 434 =1290÷43+1591÷43 =30+37 3.2×42.3×3.75-12.5×0.423×16 =3.2×42.3×3.75-1.25×42.3×1.6 =42.3×

4、;(3.2×3.75-1.25×1.6) =42.3×(4×0.8×3.75-1.25×4×0.4) =42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×(4x0.4x7.5-1.25x4x0.4) =42.3×4×0.4×(7.5-1.25) =42.3×4×0.4×6.25 =42.3×(4×2.5) =4237 1.8+18÷1.5-0.

5、5×0.3 =1.8+12-0.15 =13.8-0.15 =13.65 6.5×8+3.5×8-47 =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 8×7分之4÷1÷(3.2-2.95) =8×4/7÷1÷0.25 =8×4/7÷4 =8/7 2700×（506499）÷900 =2700×7÷900 =18900÷900 =21

6、33.02（148.490.85）÷2.5 =33.0257.55÷2.5 =33.0223.02 =10 （1÷11）÷5.1 =（11）÷5.1 =0÷5.1 =0 18.1（30.299÷0.23）×1 =18.11.7×1 =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+19/6= 1.25 -26.54+-6.14+18.

7、54+6.14= -8 1.125+-17/5+-1/8+-0.6= -3 0.45×2.51.125 0.8×1.251 0.3×3.61.08 0.3×0.30.09 10×0.07 0.7 0.92×0.4 0.368 0.2×0.260.052 0.14×40.56 0.02×0.10.002 1.2×0.3 0.362.5×0.41 2.4×512 0.22×4 0.88 3.25×00 0.90.52 0.38 3.99×13.99

8、0×3.52 0 12.5×8100 8÷10 = 0.8 10-1.8-7.2= 1 0.43+3.57= 4 2.5×4×12=144 0.9×0.8= 0.72 7.5x-3x = 4.5x a+3a+7a= 11a 1.05×100= 105 1÷0.5= 2 0.96÷3= 0.32 0.56×100= 56 3.78×100= 378 4÷0.8 =5 3.215×100= 321.5 0.8×10= 8 4.08×100= 408

9、1.1×0.2 =0.22 0.6×0.8 = 0.48 3×0.9= 2.7 2.5×0.4= 1 0.16×5 0.8 1.782.2 = 3.98 1.2×0.5-0.4 = 0.2 0.7÷0.01 = 70 2.5×0.4 = 1 123.9= 8.1 1.25×8÷1.25 = 8 6.6÷0.66 = 10 5.37×0+4.63 =4.63 3.92.03 5.93 7.22.810 1.4×5= 7 3/5+(-2/3) =9/15+(-10/15

10、) =-(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)+4+(-0.43) =-0.43 5/6+(-3/4) =10/12+(-9/12) =10/12-9/12 =1/12 (-57/

11、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+2/3-4/9 =(-0.02-0.48)+(6/9-4/9) =-5/18 (-2)-(-25) =(-2)+(+25) =23 1/

12、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*(-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*7/3÷3=-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