www.5129.net > 2.9x2.9+2.9x6.1+2.9巧算

2.9x2.9+2.9x6.1+2.9巧算

=2.9*(2.9+6.1+1) =2.9*10 =29

9.9*6.6+3.3*10.2 =9.9*6.6+9.9*3.4 =9.9*(6.6+3.4) =

1×2+2×3++8×9 太长了,就不抄全了。 =1×(1+1)+2

4.44x6.66+2.22x6.66 =(4.44+2.22)×6.66 =6.66×6.66

9.3×(1+6.3+2.7)

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