Take 5 pieces of the card paper. Write t...

Take 5 pieces of the card paper. Write the following statements one on each paper. `(a+b)/b=(c+d)/d `
`a/c=b/d`
a/b=(ac)/(bd)`
`c/d=(c-a)/(d-b) `
`a/b=(rc)/(rd)` a,b,c,d are positive mumbers nd a/b=c/d is given. Which of the above statement are true and false, write at the back of each card, if false explain why.

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