Please let me know the mistake in this equation:
-20=-20
16-36=25-45
42 -4*9=52-5*9
42 - 2*4* 9/2=52 -2*5* 9/2
(4-9/2)2 = (5-9/2)2
4=5
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2
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14
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7
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6
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3
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7
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3
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15
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8
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15
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8
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4
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8
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18
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9
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5
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20
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12
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20
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12
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2
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Which of the following pairs represent the same rational number?
(i) (ii) (iii)
(iv) (v) (vi)
(vii)