第19页

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=931-(354+146)
=931-500
=431
=824-224-196
=600-196
=404
=(572-72)-(165+135) =500-300 =200
=685+(136+144)
=685+280
=965
=685-(136+144)
=685-280
=405
=314+86+463
=400+463
=863
345 - 99 = (345 + 1) - (99 + 1)
=(234+1)-(99+1)
=235-100
=135
=(451+2)-(198+2)
=453-200
=253
=(532+3)-(97+3)
=535-100
=435
=800-(1+2+3+4+5+95+96+97+98+99)
=800-[(1+99)+(2+98)+(3+97)+(4+96)+(5+95)]
=800-500
=300