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Автор - kkk510

1) 0,4 * 2 + 1/5

2) 4 3/7 : 1/7 - 1

3) 8х - 5 = x - 40​

Ответ

Автор - amirabasov04

Ответ:

1). 0,4=4/10; 1/5= 2/10


1. 4/10×2=8/10


2. 8/10+2/10= 10/10= 1


2. 1. 31/7: 1:7 = 31


2. 31-1=30


3. 1. 8х-х=40+5


7х=-35


х=-35:7


х=-5


удачи!!!!!

Объяснение:

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