3/2×5/7-(-5/7)×5/2+(-1/2)×5/7(用简便方法计算)
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3/2×5/7-(-5/7)×5/2+(-1/2)×5/7(用简便方法计算)
3/2×5/7-(-5/7)×5/2+(-1/2)×5/7(用简便方法计算)
3/2×5/7-(-5/7)×5/2+(-1/2)×5/7(用简便方法计算)
您好:
3/2×5/7-(-5/7)×5/2+(-1/2)×5/7
=3/2×5/7+5/7×5/2-1/2×5/7
=5/7x(3/2+5/2-1/2)
=5/7x7/2
=5/2
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