用简便方法计算.138×25×4 569+68+132+31 2300-165-35 125×(8+4) 3200÷25÷4 28×37+74×37-37×2 25×204 201×75-75.
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1138254=138254=138100=1380025696813231=5693168132=600200=8003230016535=230016535=2300200=2100412584=12581254=1000500=150053200254=3200254=3200100=32628377437372=3728742=37100=3700725204=25200254=5000100=5010082017575=752011=75200=15000...
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