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srhfun
@srhfun
January 2021
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Bonjour c'est un devoir maison en math 3ème mercii de m'aider!!
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Exo 1
A=24/35 - (3/5-9/7)/(2-11/4)
A=24/35 - (21/35-45/35)/(8/4-11/4)
A=24/35 - (-24/35) / (-3/4)
A=24/35- (24/35)*(4/3)
A=(24/35) * (1-4/3)
A=(24/35) * (-1/3)
A= - (24*3)/35
A= 72/35
B=(7*10⁻¹² * 0.04*10¹⁵) / (2*10⁻⁴ * 2.5* ( 10⁵)⁻³)
B=(7*0.04 * 10³) / (2*2.5 * 10⁻⁴ * 10⁻¹⁵)
B= (0.28 * 10³) / (5* 10⁻¹⁹)
B= (0.28/5) * 10²²
B= 1.4 * 10²²
exo 4
soit x la superficie totale de la France
3/5x=terres agricoles
le reste= x-3/5x=2/5x
2/3 du reste de x = 147 000 km² ⇒ (2/3)*(2/5)*x=147000
⇔(4/15)*x = 147 000 ⇔x=147 000*15/4 ⇔551250 km²
exo 5
AI²=AB²+BI² ⇔ AI²=3²+1²=9+1=10
DI²=DC²+CI² ⇔ DI²=3²+9²=9+81=90
AID rectangle en I ⇔AI² + ID² = AD²
AI²+ID²=10+90=100
et AD²=10²=100
donc AID est rectangle en I
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Verified answer
Exo 1A=24/35 - (3/5-9/7)/(2-11/4)
A=24/35 - (21/35-45/35)/(8/4-11/4)
A=24/35 - (-24/35) / (-3/4)
A=24/35- (24/35)*(4/3)
A=(24/35) * (1-4/3)
A=(24/35) * (-1/3)
A= - (24*3)/35
A= 72/35
B=(7*10⁻¹² * 0.04*10¹⁵) / (2*10⁻⁴ * 2.5* ( 10⁵)⁻³)
B=(7*0.04 * 10³) / (2*2.5 * 10⁻⁴ * 10⁻¹⁵)
B= (0.28 * 10³) / (5* 10⁻¹⁹)
B= (0.28/5) * 10²²
B= 1.4 * 10²²
exo 4
soit x la superficie totale de la France
3/5x=terres agricoles
le reste= x-3/5x=2/5x
2/3 du reste de x = 147 000 km² ⇒ (2/3)*(2/5)*x=147000
⇔(4/15)*x = 147 000 ⇔x=147 000*15/4 ⇔551250 km²
exo 5
AI²=AB²+BI² ⇔ AI²=3²+1²=9+1=10
DI²=DC²+CI² ⇔ DI²=3²+9²=9+81=90
AID rectangle en I ⇔AI² + ID² = AD²
AI²+ID²=10+90=100
et AD²=10²=100
donc AID est rectangle en I