1) (⅔а – ¾b)(⅔a + ¾b);
2) (1,2x² –1,3y⁴)(1,2x²+1,3y⁴);
3) (5–⅓x²)(⅓x²+5);
4) (0,5a³ –b²)( b²+0,5a³).
Дам 10 бал.
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