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脱式1 998+1246+99892 1+2+3+4+.+99+1003 99+99*994 148*99-6525 6

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/08/27 15:47:20
脱式
1 998+1246+9989
2 1+2+3+4+.+99+100
3 99+99*99
4 148*99-652
5 606/13+1994/13
6 306*51/17
7 416*221/17*34/208
8 4848/202
9 4*200+0.4*500
10 0.035*935+0.035+3*0.035+0.07*61*0.5
11 64*125/8
12 0.25*11+0.25
1 998+1246+9989
=1000-2+1246+10000-11
=11000+1233
=12233
2 1+2+3+4+.+99+100
=(1+100)*100/2=5050
3 99+99*99
=99(1+99)
=99*100
=9900
4 148*99-652
=148(100-1)-652
=14800-(148+652)
=14800-800
=14000
5 606/13+1994/13
=(606+1994)/13
=2600/13
=200
6 306*51/17
=306*3
=918
7 416*(221/17)*(34/208)
=416*(221*2/208)
=4*221
=884
8 4848/202
=48*101/202
=24
9 4*200+0.4*500
=4*(200+50)
=4*250
=1000
10 0.035*935+0.035+3*0.035+0.07*61*0.5
=0.035(935+1+3)+0.035*61
=0.035(939+61)
=0.035*1000
=35
11 64*125/8
=8*125
=1000
12 0.25*11+0.25
=0.25(11+1)
=12/4
=3