Объяснение:
1. 2b^3/5a^4
2. (a+3)^2/(a-3)×(a+3)=a+3/a-3=7+3/7-3=2.5
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Объяснение:
1. 2b^3/5a^4
2. (a+3)^2/(a-3)×(a+3)=a+3/a-3=7+3/7-3=2.5