1.49+499+4999+49999+49991.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷136.

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 17:24:19
1.49+499+4999+49999+49991.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷136.
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1.49+499+4999+49999+49991.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷136.
1.49+499+4999+49999+4999
1.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷13
6.(0.36×5.1×81)÷(0.17×8.1×0.4)
六道都要写

1.49+499+4999+49999+49991.49+499+4999+49999+499999; 2.(1+11+21+31+41)+(9+19+29+39+49) 3.(9999+9997+1995+……+9001)-(1+3+5+……+999 ) 4.123+234+345+456+5657+678+789 5.1400÷25÷8+350÷4÷125 6.9÷13+13÷9+11÷13+14÷9+6÷136.
1
49+499+4999+49999+499999
=(50+500+5000+50000+500000)-1X5
=555550-5
=555545
2
(1+11+21+31+41)+(9+19+29+39+49)
=(1+49)+(11+39)+(21+29)+(31+19)+(41+9)
=50X5
=250
3
.(9999+9997+9995+……+9001)-(1+3+5+……+999 )
=(9999-999)+(9997-997)+(9995-995)+.+(9001-1)
=9000X999
=9000X(1000-1)
=8991000
4
111+789+12+222+678+12+333+567+12+456
=900+900+900+456+36
=2700+500-8
=3192
5
1400÷25÷8+350÷4÷125+69÷13+13÷9+11÷13+14÷9+6÷13
=(1400÷200)+(350÷500)+(69+11+6)÷13+(13+14)÷9
=7+0.7+86÷13+27÷9
=16.7+8÷13
=17.315
6
.(0.36×5.1×81)÷(0.17×8.1×0.4)
=(0.36÷0.4)×(5.1÷0.17)×(81÷8.1)
=0.9×30×10
=270

1
49+499+4999+49999+499999
=(50+500+5000+50000+500000)-1X5
=555550-5
=555545
2
(1+11+21+31+41)+(9+19+29+39+49)
=(1+49)+(11+39)+(21+29)+(31+19)+(41+9)
=50X5
=250

全部展开

1
49+499+4999+49999+499999
=(50+500+5000+50000+500000)-1X5
=555550-5
=555545
2
(1+11+21+31+41)+(9+19+29+39+49)
=(1+49)+(11+39)+(21+29)+(31+19)+(41+9)
=50X5
=250
3
.(9999+9997+9995+……+9001)-(1+3+5+……+999 )
=(9999-999)+(9997-997)+(9995-995)+......+(9001-1)
=9000X999
=9000X(1000-1)
=8991000
4
111+789+12+222+678+12+333+567+12+456
=900+900+900+456+36
=2700+500-8
=3192
5 仅供参考
1400÷25÷8+350÷4÷125+69÷13+13÷9+11÷13+14÷9+6÷13
=(1400÷200)+(350÷500)+(69+11+6)÷13+(13+14)÷9
=7+0.7+86÷13+27÷9
=16.7+8÷13
=17.315
6
.(0.36×5.1×81)÷(0.17×8.1×0.4)
=(0.36÷0.4)×(5.1÷0.17)×(81÷8.1)
=0.9×30×10
=270

收起

1
49+499+4999+49999+499999
=(50+500+5000+50000+500000)-1X5
=555550-5
=555545
2
(1+11+21+31+41)+(9+19+29+39+49)
=(1+9)+(11+19)+(21+29)+(31+39)+(41+49)
=10+30+50+70+90
=250
其他不知道了

1. 49+499+4999+49999+499999
; 50+500+5000+50000+500000-1-1-1-1-1
555550-5
555545
2. (1+11+21+31+41)+(9+19+29+39+49)
10+30+50+70+90
250
3.(9999+9997+19...

全部展开

1. 49+499+4999+49999+499999
; 50+500+5000+50000+500000-1-1-1-1-1
555550-5
555545
2. (1+11+21+31+41)+(9+19+29+39+49)
10+30+50+70+90
250
3.(9999+9997+1995+……+9001)-(1+3+5+……+999)
9000乘500
4500000
4. 123+234+345+456+567+678+789
123乘7+111乘21
《41+111》乘21
152乘21
3192
5.1400÷25÷8+350÷4÷125 + 6.9÷13+13÷9+11÷13+14÷9+6÷13
1400除以200+350除以500+《6.9 +11+6》除以13+《13+14》除以9
16.7+8÷13
17.315
6.(0.36×5.1×81)÷(0.17×8.1×0.4)
0.36除以0.4)乘(5.1除以0.17)乘(81除以8.1)
0.9乘30乘10
270

收起