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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