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1600x25巧算

1600x25巧算 解:根据拆分法和结合律的运用, 原式=400x4x25 =400x100 =40000

36x25-25x20+16x75 = 36x25-25x20+16x25X3 =36x25-25x20+25X48 =25X(36-20+48) =25X64 (=25X4X16)个人觉得这一步可要可不要·、 =1600

(40-3)×25 =40×25-3×25 =1000-75 =925

4800x25 =48x25x100 =(40+8)x25x100 =(40x25+8x25)x100 =(1000+200)x100 =120000

25x(17十13)一250 25x30一250 750一250 500

4x(125x25) =4×25×125 =100×125 =12500

原式=(33+11)×25 =44×25 =(40+4)×25 =40×25+4×25 =1000+100 =1100

36x25=9x4x25=900

求解…怎么巧算25X25+25X25 解: 25X25+25X25 =25×25×2 =25×50 =1250

若一个整数的末尾两位数能被4整除,则这个数能被4整除 ∴13753x25 =(13752+1)x25 =3438×4×25+25 =343800+25 =343825

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