1x2x3x4x5x6x7x8x9x10的简便运算

1x2x3x4x5x6x7x8x9x10的简便运算

1x2x3x4x5x6x7x8x9x10的简便运算

1x2x3x4x5x6x7x8x9x10

=(1X2X5X10)X(6X9)X(7X8)X(3X4)

=100X(54X56)X12

=100X3024X(10+2)

=3024000+604800

=3628800

1x2x3x4x5x6x7x8x9x10

=1×2×5×10×4×8×6×3×9×7

=100×2²×2³×2×3×3×3²×7

=100×2³×2³×3²×3²×7

=100×8×8×9×9×7

=6400×81×7

=3628800

1*2*3*4**6*7*8*9*10

=(5-4)*(5-3)*(5-2)*(5-1)*(5*(5+1)*(5+2)*(5+3)*(5+4)*(5+5)

=(5-4)*(5+4)*(5-3)*(5+3)*(5-2)*(5+2)*(5-1)*(5+1)*5

=后面是中学的算法啦