Заранее ! вычислите: ( 4 4/9х + 3 1/6 ) *3-9 - вопрос №44931639132253416073 от ekatsinrom 06.01.2021 07:10

Question

Математика: Заранее ! вычислите: ( 4 4/9х + 3 1/6 ) *3-9 1/3х, если х= 2 2/5

ekatsinrom · Answer

(4 4/9 * 2 2/5 + 3 1/6) * 3 - 9 1/3 * 2 2/5 = 19 1/10
1) 4 4/9 * 2 2/5 = 40/9 * 12/5 = 32/3 = 10 2/3
2) 10 2/3 + 3 1/6 = 10 4/6 + 3 1/6 = 13 5/6
3) 13 5/6 * 3 = 83/6 * 3 = 83/2 = 41 1/2
4) 9 1/3 * 2 2/5 = 28/3 * 12/5 = 112/5 = 22 2/5
5) 41 1/2 - 22 2/5 = 41 5/10 - 22 4/10 = 19 1/10 = 19,1