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ГДЗ Алгебра 7 клас Істер (2024)
2. ЦІЛІ ВИРАЗИ
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Виконайте множення:
1) 1/4m2n(2,4mn – 2,8m2) = 1/4m2n ∙ 24/10mn – 1/4m2n ∙ 28/10m2 = 3/5m3n2 – 7/10m4n;
2) –2/5ab3(1,5ab – 5/6b2) = –2/5ab3 ∙ 15/10ab – (–2/5)ab3 ∙ 5/6b2 = –3/5a2b4 + 1/3ab5;
3) (11/2x2y – 9/10xy4) ∙ 2/3xy3 = 3/2x2y ∙ 2/3xy3 – 9/10xy4 ∙ 2/3xy3 = x3y4 – 3/5x2y7;
4) (1,5a – 4/7b) ∙ (–1/14a2b5) = 15/10a ∙ (–1/14a2b5) – 4/7b ∙ (–1/14a2b5) = –3/28a3b5 + 2/49a2b6.
1) 1/4m2n(2,4mn – 2,8m2) = 1/4m2n ∙ 24/10mn – 1/4m2n ∙ 28/10m2 = 3/5m3n2 – 7/10m4n;
2) –2/5ab3(1,5ab – 5/6b2) = –2/5ab3 ∙ 15/10ab – (–2/5)ab3 ∙ 5/6b2 = –3/5a2b4 + 1/3ab5;
3) (11/2x2y – 9/10xy4) ∙ 2/3xy3 = 3/2x2y ∙ 2/3xy3 – 9/10xy4 ∙ 2/3xy3 = x3y4 – 3/5x2y7;
4) (1,5a – 4/7b) ∙ (–1/14a2b5) = 15/10a ∙ (–1/14a2b5) – 4/7b ∙ (–1/14a2b5) = –3/28a3b5 + 2/49a2b6.