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1又2分之1乘以7分之5减(负7分之5)乘以2又2分之1加(负2分之5)乘以7分之1
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1又2分之1乘以7分之5减(负7分之5)乘以2又2分之1加(负2分之5)乘以7分之1
=3/2×5/7-(-5/7)×5/2+(-5/2)×1/7
=3/2×5/7+5/7×5/2-5/7×1/2
=5/7×(3/2+5/2-1/2)
=5/7×7/2
=5/2
=3/2×5/7-(-5/7)×5/2+(-5/2)×1/7
=3/2×5/7+5/7×5/2-5/7×1/2
=5/7×(3/2+5/2-1/2)
=5/7×7/2
=5/2
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