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ГДЗ Математика 7 клас Істер (2024)
Тема 5. МНОГОЧЛЕН
Виконайте множення:
1) 1/7a2b (1,4a2 – 2,1b3) = 1/7a2b ∙ 14/10a2 – 1/7a2b ∙ 21/10b3 = 1/5a4b – 3/10a2b4;
2) –2/3x2y3 ∙ (1,2y5 – 9/10xy) = –2/3x2y3 ∙ 12/10y5 + (–2/3x2y3) ∙ (–9/10xy) = –0,8x2y8 + 0,6x3y4;
3) (11/5mn2 – 11/15m2) ∙ (–5/6m2n) = 6/5mn2 ∙ (–5/6m2n) + 16/15m2 ∙ 5/6m2n = –m3n3 – 8/9m4n;
4) (11/4m – 5/6n) ∙ 22/5m2n7 = 5/4m ∙ 12/5m2n7 – 5/6n ∙ 12/5m2n7 = 3m3n7 – 2m2n8.
1) 1/7a2b (1,4a2 – 2,1b3) = 1/7a2b ∙ 14/10a2 – 1/7a2b ∙ 21/10b3 = 1/5a4b – 3/10a2b4;
2) –2/3x2y3 ∙ (1,2y5 – 9/10xy) = –2/3x2y3 ∙ 12/10y5 + (–2/3x2y3) ∙ (–9/10xy) = –0,8x2y8 + 0,6x3y4;
3) (11/5mn2 – 11/15m2) ∙ (–5/6m2n) = 6/5mn2 ∙ (–5/6m2n) + 16/15m2 ∙ 5/6m2n = –m3n3 – 8/9m4n;
4) (11/4m – 5/6n) ∙ 22/5m2n7 = 5/4m ∙ 12/5m2n7 – 5/6n ∙ 12/5m2n7 = 3m3n7 – 2m2n8.