Помогите пожалуйста решить дроби ! Найди значения и произведений :1)...

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Помогите пожалуйста решить дроби ! Найди значения и произведений :
1) 3/4×1/5=
2)2/5×2/3=
3)3/8×5/7=
4)1/9×2/3=
4)3/7×7/4=


Математика (22 баллов) | 16 просмотров
Дано ответов: 2
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Ответ: 17//100

Решаем по действиям:
1. 1 1//2=3//2
1 1//2=(1*2+1)//2
1.1. 2+1=3
+2
_1_
3
2. 2 2//3=8//3
2 2//3=(2*3+2)//3
2.1. 2*3=6
X2
_3_
6
2.2. 6+2=8
+6
_2_
8
3. (3//2)+(8//3)=(25//6)
4. 3 3//4=15//4
3 3//4=(3*4+3)//4
4.1. 3*4=12
X3
_4_
12
4.2. 12+3=15
+12
_ _3_
15
5. (25//6)/(15//4)=(10//9)
6. (10//9)-(2//5)=(32//45)
7. 8 8//9=80//9
8 8//9=(8*9+8)//9
7.1. 8*9=72
X8
_9_
72
7.2. 72+8=80
+72
_ _8_
80
8. (32//45)/(-(80//9))=-(32//45)/(80//9)
9. (32//45)/(80//9)=(2//25)
10. -(2//25)+(1//4)=(17//100)

Решаем по шагам:
1. (((3//2)+(2 2//3))/(3 3//4)-(2//5))/(-(8 8//9))+(1//4)
1.1. 1 1//2=3//2
1 1//2=(1*2+1)//2
1.1.1. 2+1=3
+2
_1_
3
2. (((3//2)+(8//3))/(3 3//4)-(2//5))/(-(8 8//9))+(1//4)
2.1. 2 2//3=8//3
2 2//3=(2*3+2)//3
2.1.1. 2*3=6

2.1.2. 6+2=8

3. ((25//6)/(3 3//4)-(2//5))/(-(8 8//9))+(1//4)
3.1. (3//2)+(8//3)=(25//6)
4. ((25//6)/(15//4)-(2//5))/(-(8 8//9))+(1//4)
4.1. 3 3//4=15//4
3 3//4=(3*4+3)//4
4.1.1. 3*4=12

4.1.2. 12+3=15

5. ((10//9)-(2//5))/(-(8 8//9))+(1//4)
5.1. (25//6)/(15//4)=(10//9)
6. (32//45)/(-(8 8//9))+(1//4)
6.1. (10//9)-(2//5)=(32//45)
7. (32//45)/(-(80//9))+(1//4)
7.1. 8 8//9=80//9
8 8//9=(8*9+8)//9
7.1.1. 8*9=72

7.1.2. 72+8=80
+72
_ _8_
80
8. -(32//45)/(80//9)+(1//4)
8.1. (32//45)/(-(80//9))=-(32//45)/(80//9)
9. -(2//25)+(1//4)
9.1. (32//45)/(80//9)=(2//25)
10. 17//100
10.1. -(2//25)+(1//4)=(17//100)

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0

что то совсем все не понятно

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1)3/4x1/5=3/20
2)2/5x2/3=4/15
3)3/8x5/7=15/56
4)1/9x2/3=2/27
5)3/7x7/4=21/28

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