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tauaanny
@tauaanny
October 2020
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um terreno com a forma de retangulo tem perimetro de 70 m e a razao entre o comprimento e a largura e 2 sobre 5 . calcule a area desse terreno resposta
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lucasalm
Perimetro2x+2y=70
x/y=2/5
5x=2y
2x+2y=70
5x=2y
2x+5x=70
7x=70
x=70/10
x=10
2.10+2y=70
20+2y=70
2y=70-20
2y=50
y=50/2
y=25
A=25x10
A=250m²
21 votes
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x/y=2/5
5x=2y
2x+2y=70
5x=2y
2x+5x=70
7x=70
x=70/10
x=10
2.10+2y=70
20+2y=70
2y=70-20
2y=50
y=50/2
y=25
A=25x10A=250m²