Question

Решите,СРОЧНО НАДО.ПОЖАЛУЙСТА

Answer 1

22
1)1/(a+4)-1/(a-4)=(a-4-a-4)/(a²-16)=-8/(a²-16)
2)a(a²-16)*[-8/(a²-16)]=-8a
a=-45  -8*(-45)=340
23
$100^n/(5 ^{2n-1} *4 ^{n-2})=5 ^{2n} *4^4/[5 ^{2n-1} *4 ^{n-2} ]=5*4^2=5*16=80$
24
$(2x)^4*x ^{-10} /(x ^{-9}*5x^3]=16x^4/(x*5x^3)=16/5=3,2$