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用简便计算 56 103

103x56 =(100+3)x56 =100x56+3x56 =5600+168 =5768

=100*56+3*56 =5600+168 =5768

103*56=(100+3)*56=100*56+3*56=5600+168=5768

103*56=(100+3)*56=5600+168=5768

103x56-3x56=(103-3)x56=100x56=5600

52*103-156=52*103-52*3=52*(103-3)=52*100=5200

76x103 =76x(100+3) =76x100+76x3 =7600+228 =7828

520-103=400+120-103=400+17=417

原式=(100+3)x24=100x24+3x24=2400+72=2472 供参考.

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