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64×99用简便计算

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64×99×2+128 =128x(99+1) =128x100 =12800

64×(99+1)=6400

=64×(99+1) =64×100 =6400

64*100-64+64=6400

64x(100-1)=64x100-64x1=6400-64=6336

99x64 =(100-1)*64 =100*64-64 =6400-64 =6336

=(99+1)×64 =100×64 =6400

(125×99加上125)乘64 =125×(99加上1)乘64 =125×100×8×8 =(125×8)×(100×8) =1000×800 =800000

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