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Karolinakush
@Karolinakush
July 2022
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1) найдите неизвестный член пропорции: х/-1,5=-5,2/-3
2) вычисли: 8*(-7)
3) вычислите : 3*(-0,9)
4) вычислите: -6,3*(-3/4)
5) -0,7*(-7 целых 1/7)
6) 3:(-3)
7) -2,4:1/25
8) (-3 целых 2/9):(-10 целых 1/9) пожалуйста срочно 25 баллов
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svetazuna
1.
х / -1,5 = -5,2 / -3,
х = (-1,5 * (-5,2)) / (-3) = -5,2 / 2 = -2,6 ⇒ -2,6 / -1,5 = -5,2 / -3,
2.
8 * (-7) = -56,
3.
3 * (-0,9) = -2,7,
4.
-6,3 * (-3/4) = 63/10 * 3/4 = 189/40 = 4,725 (или 4 29/40),
5.
-0,7 * (-7 1/7) = 7/10 * 50/7 = 5,
6.
3 : (-3) = -1,
7.
-2,4 : 1/25 = -24/10 * 25 = -12 * 5 = -60,
8.
(-3 2/9) : (-10 1/9) = 29/9 : 91/9 = 29/9 * 9/91 = 29/91
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Answers & Comments
х / -1,5 = -5,2 / -3,
х = (-1,5 * (-5,2)) / (-3) = -5,2 / 2 = -2,6 ⇒ -2,6 / -1,5 = -5,2 / -3,
2.
8 * (-7) = -56,
3.
3 * (-0,9) = -2,7,
4.
-6,3 * (-3/4) = 63/10 * 3/4 = 189/40 = 4,725 (или 4 29/40),
5.
-0,7 * (-7 1/7) = 7/10 * 50/7 = 5,
6.
3 : (-3) = -1,
7.
-2,4 : 1/25 = -24/10 * 25 = -12 * 5 = -60,
8.
(-3 2/9) : (-10 1/9) = 29/9 : 91/9 = 29/9 * 9/91 = 29/91