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Let's find values of the following menta...

Let's find values of the following mentally:-
`3a xx 4b = ?`

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JNAN PUBLICATION-ALGEBRIC OPERATIONS-EXAMPLE
  1. Let's Multiply : (frac(x)(y) - frac(y)(3)) (frac(2x)3) - frac(3y)(5)

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  2. Let's Multiply : (frac(2a^2)(9) - frac(1)(7)) (frac(3a)(5) - frac(2)...

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  3. Let's find values of the following mentally:- 3a xx 4b = ?

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  4. Let's find values of the following mentally:- 12 ab div 3a = ?

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  5. Let's find values of the following mentally:- 12ab div ? = 4ab

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  6. Let's find values of the following mentally:- (-x^2) xx x = ?

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  7. Let's find values of the following mentally:- 9x^2 div 3x^2 = ?

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  8. Let's find values of the following mentally:- x^2 xx x^2 = ?

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  9. Let's find values of the following mentally:- x^2÷? = 1

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  10. Let's find values of the following mentally:- 0 div ab =

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  11. Let's find values of the following mentally:- 4a^2b^2c^2 × ? = 0

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  12. Let's multiply :- 2x^2 xx (-3y) xx 6z

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  13. Let's multiply :- 7xy^2 xx 8x^2y xx xy

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  14. Let's multiply :- (-3a^2) xx (4a^2b) xx (-2)

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  15. Let's multiply :- (-2mn) xx frac(1)(6) m^2n^2 xx 13 m^4n^4

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  16. Let's multiply :- frac(2)(3)x^2y xx frac(3)(5)xy^2

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  17. Let's multiply :- (-frac(18)(5) x^2) xx (-frac(25)(6) xx z^2y)

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  18. Let's multiply :- (-frac(3)(5)s^2t) xx (frac(15)(7) st^2 u)×(frac(7)...

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  19. Let's multiply :- (frac(4)(3)x^2zy) xx (frac(1)(3) y^2 zx) × (-6xyz)

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  20. Let's multiply :- 4a (3a + 7b)

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