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aleshina77
@aleshina77
July 2022
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1. 0,2 * (5/7 х - 1,2) = 3/7 х - 0,64
2. 0,4 * (1,3 + 5/9 х) = 7/9 х - 1,48
3. 7/20 : 3 х = 0,007 : 0,72
4. 0,375 : 1,04 = 3 11/13 : 4 х
ПОЖАЛУЙСТА! Помогите,очень нужно )))
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1401Tamara
1. 0,2 * (5/7 х - 1,2) = 3/7 х - 0,64
1/7x - 0,24 = 3/7x - 0,64
0,4 = 2/7x
x = 0,4:2/7 = 0,4*7/2= 1,4
2. 0,4 * (1,3 + 5/9 х) = 7/9 х - 1,48
0,52 + 2/9x = 7/9x - 1,48
5/9x = 2
x = 2:5/9= 2 * 9/5 = 18/5 = 3 3/5
3. 7/20 : 3 х = 0,007 : 0,72
x = 7/20 : (7/100 : 72/100) = 7/20 : 7/72 = 7/20*72/7 = 72/20 = 3,6
4. 0,375 : 1,04 = 3 11/13 : 4 х
375/1000 : 104/100 = 375/1000* 100/104 = 75/208
4x = 3 11/13 : 75/208
4x = 50/13 : 75/208
4x = 50/13*208/75 = 32/3
x = 32/3:4 = 8/3 = 2 2/3
2 votes
Thanks 2
1401Tamara
пожалуйста. хороших каникул!!!
aleshina77
Спасибо!)) Тебе тоже;)
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Answers & Comments
1/7x - 0,24 = 3/7x - 0,64
0,4 = 2/7x
x = 0,4:2/7 = 0,4*7/2= 1,4
2. 0,4 * (1,3 + 5/9 х) = 7/9 х - 1,48
0,52 + 2/9x = 7/9x - 1,48
5/9x = 2
x = 2:5/9= 2 * 9/5 = 18/5 = 3 3/5
3. 7/20 : 3 х = 0,007 : 0,72
x = 7/20 : (7/100 : 72/100) = 7/20 : 7/72 = 7/20*72/7 = 72/20 = 3,6
4. 0,375 : 1,04 = 3 11/13 : 4 х
375/1000 : 104/100 = 375/1000* 100/104 = 75/208
4x = 3 11/13 : 75/208
4x = 50/13 : 75/208
4x = 50/13*208/75 = 32/3
x = 32/3:4 = 8/3 = 2 2/3