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1、7X 8-19 =(13 + 17) X 5=63 3=310X 3 =300 6=800 8 =720-9 =0X 37=600X3 =600-3 =300 X 3=37 + 8=9X 0X20 =840-4=480 8 =6408 =2X 14=630 3 =800-8 =140 2 =62 - 33 =8808 =660 6=500 + 500=9X 500=7X 800=800 2 =42 X 3=7 X 700=0 47 =90 3=840 2 =560 7 =1803 =430 X 2 =4404 =3005 =540 9=93 3=48 4=31X 3 =30X4X 2=9303
2、 =96 3 =24 X 2 =64 8X 5=2X 330=0 54=8004 =200 4=72 9 4=9003 =50X 6 =7X 80=4509 =60X 4 + 38 =24 X 2 =3606 =620 2 =(74-38) 6 =37+ 56=6 X 800=5X 90=32 X 3=(20 + 36) 7=6X 500=70 X 7=960 3=8X 70=7400+ 30 =5X 900=70 X 5+ 28 =22 X 4=200 X 4 =40 - 2=6X 60=420-6 =300-6 =360 - 9 =490-7 =300 X 3 =80 X 4=65 X 0
3、=7X 8-19 =330-3 =250-5 =880-2 =56 - 7- 2 =400-4 =1X 66=6408 =880-4 =360 - 6=200-4=630-7=0-43 =43X 2 =8X 200=0-73 =100-5=26-6 X 2 =350-5=(60 + 30) - 3=240 X 2 =400-8=480-8=50X 5 =800 X 3=410X 2 =440 - 4=420-6=300-6=240 - 4=900-9=810-9=630-9 =330X3 =480-8 =18 + 2X 9=300-5 =420-2 =820-2 =(42-12) -5 =40
4、0-4 =900X5 =200-4 =16 + 4X 4=200X4 =540-6 =0-49=120X4 =640-8 =20X 3X 6=720-9 =660-2 =700X5 =660-6 =600-6 =40x 2X 4 =360 - 6=200-4=22 X 3=200-5=6X 0X6 =800-8 =(13-5) X 90 =720-9=720-8 =720-8=80- 8=320-4 =270-9=75-64=900-3 =300-6=320-4=30 X 8+ 8 =150 - 5=200-4=84 - 4=490 - 7=40- 5- 2=640 - 2 =90 X 4=1
5、50-3=700 X 5 =90 - 3=100-5=360 - 6 =42-6X 6=(40 + 80) - 4=(8 + 7) X 2 =240 - 4=420-6=99 - 9=90 X 9=180-2=600-3 =300 5=210-7=43+ 38=420-7=800 - 8=720-8 =720-9=300-6=800-8 =49-7X 7=180-3=120X 4 =300-6=50 X 2=640 - 2 =140-2=480-6=93 - 3=700 X 8=17+ 8X 2 =900-3=350-5=8X 3-4=180-2=5 X 6+41=400 X 7=(15 +
6、45) X 8=360 - 9=350-7=(95-35) - 2 =360-4=4X 200=36+24二450-5=48- 6X 4=120-2=300-6=300 X 6=78-19=420-7=280-7=300 X 8=100-5=240 - 8=12-4+9=40 X 4=3 X90=160-4=18-2-3=(2 + 48) X8 =270 -9=280-4=4X 100=400 - 8=360-9=120-3=360 - 6=320-8=400X9=810 - 9=180-6=810-9=300 5=630-3=5X 7-20=420-6=630-7=900X5=20X 5 +
7、 38 =9X 5-26 =5X9-5=200-4=540 - 9=140-2=720-9=60X 5=210-3=42- 6X 8=300 5=80 X 4=150-3=(260 + 10) - 9240 - 4=180-2=60 X 6=800 X 7=40- 2=400-5=160-2=60- 2=80 X 7=4X 8+52=420-6=160-8=420-7=40 X 9=64 - 8X 8=720-9=210-3=450-9=630-9=75+34=40 X 6+ 24 =25-5X 8=57+33=900 X 2=720-8=400-8=80-4=28- 7X 90 =72X 9
8、X 0=490-7=9X 800=22 X 4=100-2=80 - 4=13X 3=300 X 6=140-2=840-4=90- 3=60 X 2=400-8=9X9+12=60 - 2=22 X 4=100-仁490 - 7=12X 3=720-8=(19 + 51) X 4=840-4=810-9=100-2=99+1 =180-9=54 6X 4=31 X 3=270-9=43X 2=84 - 47=270-3=42+15=280-2=27- 9X 9=21X 3=320X2=240 - 6='60X 2X4=5X 7-18 =72 - 8- 3 =40X 3=80 X 5=
9、30 X 7=72-3=420-7=80 8=9X 110=36 - 4-9=320-4=80X 5=110X5=30 X 5=26+ 7X 3=930-3=60- 3=200 X 4=(4 + 9) X 3 =24 X 2=150X 3X 0=64 - 8-2=42 X 2=18+2X 4=420-7 =99 - 3=900- 3=3X 220=770-7 =270- 3=480-4 =660 - 3 =900 X 3=(26-17)X2 =900-3 =16+7X 2=93 - 3=180-9 =50X 4=840-4=660 - 6 =9X 200=400-8=800 X 2 =60X
10、9=450-9 =50 - 5=30X 2X 5=360-6 =3X 800=240- 6 =37 + 56 =60 X 7+ 7 =480- 8=32 X 3=420-7 =300 5=800-4 =3X 220=98+19=900-3 =480-4 =320- 8=450-9 =(26-17) X 2 =630-9=360-6 =93 - 3=30X 9+60=37 + 56 =500 X 6=30X 1 =32 X 3=40 X 4=30X 9=70 X 7=300-3=70X 3=(13 +17) X 5=300 X 3=420-6=300-6 =50 X( 2+7)=360 - 4 =0X 37=100-56=28-20 - 4=300X3 =