131.

Using identities, evaluate:

998²  

Using identities, evaluate:

5.2²

Using identities, evaluate:

^{297 x 303}

Using identities, evaluate:

^{78 x 82}

Using identities, evaluate:

^{78 x 82}

Using identities, evaluate:

^{8.9 = (9 - 0.1)}

Using identities, evaluate:

^{1.05 = (1 - 0.05) x 9.5}

Using a² – b² = (a + b)(a – b), find:

51² - 49²

Using a² – b² = (a + b)(a – b), find:

(1.02)² - (0.98)²

Using a² – b² = (a + b)(a – b), find:

153² - 147²