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Express the following numbers in the form of p :q (a) -25.6875(b) 0.621621621..(c) 15.71212121 |
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Answer»
(C) 15.7 121212.......=x Then 100x=1571.212121......... {why should we MULTIPLY with 100 only? Ans:-because TWO numbers (i.e.,1,2)are REPEATING} Now let X=15.7121212.......be equation 1 100x=1571.212121.......be equation 2 Subtract equation 1 from equation 2 100x=1571.21212121..... - x=15.7121212...... ------------------------------- 99x=1555.5 {212121.....will cancel from both the equations} X=1555.5/99 X=15555/990 |
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