Question

tim x biet 

x*x*126=2016

x+100/x=21

Answer 1

x*x*126=2016

x*x=2016:126=16

Có 4x4=16

=>x=4

Answer 2

\(x.x.126=2016\Rightarrow x^2=16\Rightarrow x=-4;4\)

\(x+\frac{100}{x}=21\Rightarrow x=7,298437881\)

Answer 3

x*x*126=2016

x*x=2016:126

x*x=16

vì 4x4=16 nên x =4

x+100/x=21

x+100/x=21

x/x+100/x=21

1+100/x=21

100/x=21-1

100:x=20

x=100:20

x=5

Answer 4

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