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19=1x9+(1+9) 29=2x9+(2+9) 39=3x9+(3+9) 1289=?

60-6=54

1x9+1=1*(9+1)=10 2x99+2=2*(99+1)=200 3x999+3=3*(999+1)=3000 an=n*10^n

你是逗比吗?

4×9999+4=40000 5×99999+5=500000 n

2.5×3.6 =2.5×4×0.9 =10×0.9 =9 16.3×9.9 =16.3×(10-0.1) =16.3×10-16.3×0.1 =163-1.63 =161.37 6.2×11+6.2×88+6.2 =6.2×(11+88+1) =6.2×100 =620 45.6×6.7+4.56×33 =4.56×67+4.56×33 =4.56×(67+33) =4.56×100 =456

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