摘要:
-× =× =× = ×2.4 =×2.4+×2.4 =2+0.9 =2.9 ×4+0.25×4+ =×4+×4+×1 =× =×10 =2.5 ×+×- =× = ×19- =×(19-1) =×18 =14 57× =(56+1)× =56×+1× =5+ =5 ×× =× =6× = × =12×-× =20- =19 ×+× =×(+) =×1 = ×+× =×+× =× = ×+×+× =×+× =×+× =× = ÷÷8 =×× = ×99+ =×(99+1) =×100 =97 36× =36×+36×-36× =9+6-4 =11 28× =(27+1)× =27×+1× =26 × =× =× = ÷ =×4 =×4 = ÷+× =×+× =× =
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