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5x supra 4 = 20 supra x​

Răspuns :

5x/4=20/x<=>5x²=80

x²=16

x=radical din 16=4

[tex] \frac{5x}{4} = \frac{20}{x} [/tex]

[tex]5x \times x = 20 \times 4[/tex]

[tex]5 {x}^{2} = 80[/tex]

[tex] {x}^{2} = 80 \div 5[/tex]

[tex] {x}^{2} = 16[/tex]

[tex]x = \sqrt{16} [/tex]

[tex]x = 4[/tex]