2X=5/8

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2X=5/8

x=5/8/2
x=5/16

X=5/8 x 2
X=5/4

x=5/8/2
x=5/16

5/8:
2X=5 除以 8
2X=0.625
X=0.625 除以 2
X=0.3125
5.8:
2X=5.8 除以 2
2X=2.54