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0.1+0.2+0.3+0.4+0000+9.9

0.1+0.2+0.3+0.4++9.7+9.8 =0.1x(1+2+3+.+98) =0.1x(1+98)x98/2 =0.1x99x49 =9.9x49 =(10-0.1)x49 =10x49-0.1x49 =490-4.9 =485.1 ,

1四大皆空, 2一无所有, 3无中生有, 4一成不变, 5始终如一, 6单打独斗, 7一分为二, 8接二连三

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