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詳解 (共 2 筆)

詳解提供者：何惠儀

x=75y=60

詳解提供者：Viva Home

x: y: z= 5: 4: 3

=5r: 4r: 3r

x-y+z=60

5r-4r+3r=60

4r=60, r=15

x=5r=5(15)=75

y=4r=r(15)=60