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37x25怎样巧算

(40-3)×25 =40×25-3×25 =1000-75 =925

(37+2x37十37)x25 =37x(1+2+1)x25 =37x(4x25) =37x100 =3700

﹙25×37+63×25﹚×8 =﹙37+63﹚×﹙25×4﹚×2 =100×100×2 =20000

=(40-3)×25 =1000-75 =925

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