1. (2x-y)/xy (0,8*2 + 5) : (-2) = 6,6 / (-2) = -3.3
2. (b^2 - c^2 ) / (b^2 - bc) = ((b-c)(b+c)) / (b(b-c)) = (b+c) / b
3. 2a / (a-b) + 2a / (a+b) = (2a(a+b) + 2a(a-b)) / ((a-b)(a+b)) = (2a^2 + 2ab + 2a^2 - 2ab) / ((a-b)(a+b)) = 4a^2 / (a^2 - b^2 )
4. 8m^2 n^2 / 5k : 4m^3 n = 2n/5km
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Answers & Comments
1. (2x-y)/xy (0,8*2 + 5) : (-2) = 6,6 / (-2) = -3.3
2. (b^2 - c^2 ) / (b^2 - bc) = ((b-c)(b+c)) / (b(b-c)) = (b+c) / b
3. 2a / (a-b) + 2a / (a+b) = (2a(a+b) + 2a(a-b)) / ((a-b)(a+b)) = (2a^2 + 2ab + 2a^2 - 2ab) / ((a-b)(a+b)) = 4a^2 / (a^2 - b^2 )
4. 8m^2 n^2 / 5k : 4m^3 n = 2n/5km