1.49+499+4999+49999+499999;2.(1+11+21+31+41)+(9+19+29+39+49)
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
人气:432 ℃ 时间:2019-10-11 21:32:08
解答
1.49+499+4999+49999+499999;
=50+500+5000+50000+500000-5
=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
=50×5
=250
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