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①
5/8÷7/12×4/7
=5/8×4/7÷7/12
=20/56×12/7
=5/14×12/7
=5/7×6/7
=30/49
②5/8÷7/12×4/7
=5/8×12/7×4/7
=5/2×3/7×4/7
=5×2/7×3/7
=10/7×3/7
=30/49
5/8÷7/12×4/7
=5/8×4/7÷7/12
=20/56×12/7
=5/14×12/7
=5/7×6/7
=30/49
②5/8÷7/12×4/7
=5/8×12/7×4/7
=5/2×3/7×4/7
=5×2/7×3/7
=10/7×3/7
=30/49
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5/8÷7/12×4/7=15/8=1.875 解释:对于此算式,可以先算后面乘法的部分,即7/12×4/7=1/3,把算出乘法的结果放入原算式中可得5/8÷1/3。5/8÷1/3可以变身为5/8*3=15/8
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5/8÷7/12×4/7
=5/8x12/7x4/7
=(5x12x4)/(8x7x7)
=(5x6x8)/(8x7x7)
=30/49
=5/8x12/7x4/7
=(5x12x4)/(8x7x7)
=(5x6x8)/(8x7x7)
=30/49
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5/8÷7/12x4/7=5/8x12/7x4/7=30/47
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