Câu hỏi của dinhkhachoang

Question

CM BẤT ĐẲNG THỨC

A;[-A^5.(-A^5)]^2+[-A^2.(-A^2)]^5=0

B;(-1)^N.A^N+K=(--A)^N.A^K

dinhkhachoang · Accepted Answer

$A=\left[-a^5.\left(-a^5\right)\right]^2+\left[-a^2.\left(-a^2\right)\right]^5=0$O

=>$\left(-a^{10}\right)^2+\left(-a^4\right)^5=a^{20}-a^{20}=0$

$B;\left(-1\right)^n.a^{a+k}=\left(-a\right)^n.a^k$

$=\left(-1\right)^n.a^n.a^k=\left(-1.a\right)^n.a^k$

=$\left(-a^n\right).a^k$

Câu trả lời:

$A=\left[-a^5.\left(-a^5\right)\right]^2+\left[-a^2.\left(-a^2\right)\right]^5=0$O

=>$\left(-a^{10}\right)^2+\left(-a^4\right)^5=a^{20}-a^{20}=0$

$B;\left(-1\right)^n.a^{a+k}=\left(-a\right)^n.a^k$

$=\left(-1\right)^n.a^n.a^k=\left(-1.a\right)^n.a^k$

=$\left(-a^n\right).a^k$