Question:৭.যদি `a : b = b : c` হয়, তবে প্রমাণ কর যে, (ii). `a^2b^2c^2(1/a^3 + 1/b^3 + 1/c^3) = a^3 + b^3 + c^3` 

Answer সমাধান: (ii).দেওয়া আছে, `a : b = b : c` বা, `a/b = b/c` `:. b^2 = ac` বামপক্ষ `= a^2b^2c^2(1/a^3 + 1/b^3 + 1/c^3)` `= (a^2b^2c^2)/a^3 + (a^2b^2c^2)/b^3 + (a^2b^2c^2)/c^3` `= (b^2c^2)/a + (a^2c^2)/b + (a^2b^2)/c` `= (b^2c^2)/a +((ac)^2)/b + (a^2b^2)/c` `= (ac.c^2)/a + ((b^2)^2)/b + (a^2 .ac)/c` [ `:.`মান বসিয়ে ] `= c^3 + b^4/b + a^3` `= c^3 + b^3 + a^3` `= a^3 + b^3 + c^3` `=`ডানপক্ষ `:. a^2b^2c^2(1/a^3 + 1/b^3 + 1/c^3) = a^3 + b^3 + c^3`( প্রমাণিত ) 

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৭.jodi `a : b = b : c` hoyo, tobe proman kar je, (ii). `a^2b^2c^2(1/a^3 + 1/b^3 + 1/c^3) = a^3 + b^3 + c^3`
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