12.34+23.45+34.56+45.67+…89.12+91.23
46.1÷5.93×593
(9.6×5×7.2)÷(4.8×0.5×3.6)
(12.7×7.2+2.8×12.7)÷0.127
11111111112222222222÷3333333333 都是十个
18×4.5
990×198.9-1989×98.9
1.1+1.2+1.3+…+1.9
0.25÷0.37×4×3.7
20.05×39+200.5×4.1+40×10.025(第3届希望杯竞赛培训题)
3333×4444+3334×2222(第4届希望杯竞赛培训题)
48.67×67+32×486.7+973.4×0.05
1.5+2.5+3.5+…+50.5
1.25+2.25+3.25+…80.25
9.9+1.1×19-0.11×80
1.625+2.625+…+16.625
1.25×5.6+2.25×4.8
53.48×82+53.48×37-53.48×19
0.9+9.9+99.9+…+999999.9
3333×4+5555×5+7777×9
8÷64÷0.25÷0.5÷0.125
3.6÷7+2.8÷7+4.5÷7+3.1÷7
12.8÷9+15.4÷9+24.3÷9+35.7÷9+91.8÷9
31÷5+32÷5+33÷5+34÷5
13.2×6.3÷1.1÷0.7+3.6÷1.8
(7.2÷1.5÷1.3)÷(3.6÷7.5÷9.1)
7.26÷1.4×4.26×2.8÷0.426÷72.6
2005×20042004-2004×20052005+2005
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46.1÷5.93×593=46.1*(5.93/593)=46.1*0.01=0.461
(9.6×5×7.2)÷(4.8×0.5×3.6)=(9.6/4.8)*(5/0.5)*(7.2/3.6)=2*10*2=40
(12.7×7.2+2.8×12.7)÷0.127=(7.2+2.8)*)12.7/0.127=10*100=1000
11111111112222222222÷3333333333=(111111111000000000+22222222222)/1111111111*3=
1000000000/3+2/3=1000000002/3=3333333334
18×4.5=20*4.5-2*4.5=81
990×198.9-1989×98.9=99*1989-1989*98.9=(99-98.9)*1989=198.9
1.1+1.2+1.3+…+1.9=(1+1+1...1)+(0.1+0.2...0.9)=9+4.5=13.5
0.25÷0.37×4×3.7=(0.25*4)追问
我明天对好了就采纳你