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x3333

原式 =3333x(3000+333) =3333x3000+3333x333 =9999000+3333x3x111 =9999000+9999x111 =9999000+(10000-1)x111 =9999000+10000x111-111 =9999000+1110000-111 =11108889

9999×8889+3333×3333+9 =9999×8889+1111×3×1111×3+9 =9999×8889+9999×1111+9 =9999×(8889+1111)+9 =9999×10000+9 =99990000+9 =99990009

原式 =3333x(3000+333) =3333x3000+3333x333 =9999000+3333x3x111 =9999000+9999x111 =9999000+(10000-1)x111 =9999000+10000x111-111 =9999000+1110000-111 =11108889

3.3333x3333.4=(3x1.1111)x(3x1.1111+0.0001) =3.3333²+3.3333x0.0001 =11.11088889+ 0.00033333 =11.11122222

3333x3333+9999x8889 =1111x3x3333+9999x8889 =1111x9999+9999x8889 =9999x(1111+8889) =9999x10000 =99990000

=2222x3333+2222x3x9999 =2222x(3333+29997) =2222x33330 =74059260

3333x3333+9999x8889+9=9999x1111+9999x8889+9=9999x(1111+8889)+9=9999x10000+9=20008

原式=9999×1111+9999×8889=9999×(1111+8889)=9999×10000=99990000

原式=3x4x1111^2+6x5x2x1111^2 =(12+60 )x 1111^2 =72x1234321 =(80 - 8)x1234321 =98745680 - 9874568 =88871112

7778x3333+1111x6666 =3333x(7778 + 2222) =3333x10000 =33330000

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