7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    Addition of \[\frac{{{a}^{2}}}{2}+\frac{{{b}^{3}}}{3}-\frac{{{c}^{3}}}{4}\], \[\frac{2{{a}^{2}}}{3}+\frac{3{{b}^{3}}}{4}-\frac{4{{c}^{3}}}{4},\] and \[{{a}^{2}}+{{b}^{3}}+{{c}^{3}}\]is ____.

    A)              \[\frac{13}{6}a+\frac{25}{12}{{b}^{3}}-\frac{1}{20}{{c}^{3}}\]

    B)              \[\frac{13}{6}{{a}^{2}}-\frac{1}{20}{{b}^{3}}+\frac{25}{12}{{c}^{3}}\]

    C)              \[\frac{13}{6}{{a}^{2}}+\frac{25}{12}{{b}^{3}}-\frac{1}{20}{{c}^{3}}\]

    D)              \[\frac{13}{6}{{a}^{2}}-\frac{25}{12}{{b}^{3}}+\frac{1}{20}{{c}^{3}}\]

    Correct Answer: C

    Solution :

    \[\left( \frac{{{a}^{2}}}{2}+\frac{{{b}^{3}}}{3}-\frac{{{c}^{3}}}{4} \right)+\left( \frac{2{{a}^{2}}}{3}+\frac{3{{b}^{3}}}{4}-\frac{4{{c}^{3}}}{5} \right)\] \[+({{a}^{2}}+{{b}^{3}}+{{c}^{3}})\]             \[=\frac{13}{6}{{a}^{2}}+\frac{25}{12}{{b}^{3}}-\frac{1}{20}{{c}^{3}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner