69+6×48-34
=69-34+6×48
=35+6×（50-2）
=35+6×50-6×2
=35+300-12
=300+35-12
=300+23
=323
=69+6×(50-2)-34
=69+6×50-6×2－34
=69+300－12－34
=69＋300－（12＋34）
=69－46＋300
=23＋300
=323
=69+6*(50-2)-34
=69+6*50-(12+34)
=69-46+300
=23+300
=323
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