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baobadao2512

Nhớ thanks nha

Câu 1: Tìm z biết
$(2x-4)^2+ |y-5|+(x+y-z)^6=0$(*)
$(2x-4)^2$\geq0 (1)
$|y-5|$\geq0 (2)
$(x+y-z)^6$\geq0 (3)
Từ (1); (2); (3) \Rightarrow $(2x-4)^2+ |y-5|+(x+y-z)^6$\geq0(**)
Từ (*); (**) \Rightarrow $(2x-4)^2=0 {và} |y-5|=0 {và} (x+y+z)^6=0$
$(2x-4)^2=0 \rightarrow x = 2$
$|y-5|=0 \rightarrow y=5$
$(x+y-z)^6=0 \rightarrow x+y-z=0$
\Rightarrow $z = 0-(2+5)=7$
 
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