Срочно!! Номера 1,2,5

Question

Срочно!! Номера 1,2,5

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Answer 1

1) 79
5)5^4*5^5/5^7
6)

Answer 2

1) 1-5*(-4)^2=1-5*16=1-80=-79

2) а. у^7*у^12=у^7+12=у^19

б. у^20:у^5=у^20-5=у^15

в.(у^2)^8=у^2*8=у^16

г.(2у)^4=16у^4

5) (25^2 * 5^5)\5^7= ( (5^2)^2 * 5^5)\5^7=(5^4 * 5^5)\5^7=(5^4+5)\5^7=5^9\5^7=5^9-7=5^2=25