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1等於2個½;1-½;=½;½;=0.5 1=2個0.5即1-0.5=0.5
四又二分之一减去它的二分之一,等於(2又1/4)
(1/2):(1/5)=(1/4):X X=(1/5)x(1/4)÷(1/2)=1/10(十分之一)
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