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Kargina2004
@Kargina2004
August 2022
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найдите значение выражения
1)0,8(3a-13)-0,6(6a-8) при a=-3 1\12
2)6 5\9(n-9)+2 2\9(18-n) при n=0,3
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sagirovna
1) при а = -3 1/12 = -37/12
3а-13 = 3*(-37/12) -13= -37/4 -13 = -9,25 -13 = -22,25
0,8*(-22,25) = -17,8
6а-8 = 6*(-37/12) = -37/2 -8 = -18,5 -8= -26,5
0,6*(-26,5) = -15,9
-17,8- (-15,9) = -17,8+15,9 = -1,9
Ответ: -1,9
2) при n = 0,3
n-9 = 0,3-9 = -8,7 = -87/10
59/9 *(-87/10) = - 59*29/30 = -1711/30
18-n = 18-0,3 = 17,7 = 177/10
20/9 * 177/10 = 59*2/3 = 118/3
-1711/30 + 118/3 = (-1711+1180)/30 = -177/10 = -17,7
Ответ: -17,7
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Answers & Comments
3а-13 = 3*(-37/12) -13= -37/4 -13 = -9,25 -13 = -22,25
0,8*(-22,25) = -17,8
6а-8 = 6*(-37/12) = -37/2 -8 = -18,5 -8= -26,5
0,6*(-26,5) = -15,9
-17,8- (-15,9) = -17,8+15,9 = -1,9
Ответ: -1,9
2) при n = 0,3
n-9 = 0,3-9 = -8,7 = -87/10
59/9 *(-87/10) = - 59*29/30 = -1711/30
18-n = 18-0,3 = 17,7 = 177/10
20/9 * 177/10 = 59*2/3 = 118/3
-1711/30 + 118/3 = (-1711+1180)/30 = -177/10 = -17,7
Ответ: -17,7