có = 0 ko bạn

1BC giống nhau

2C

3B 4A 5B 6 7C 8B 9A 10A

P=\(\dfrac{\sqrt{x}+6}{\sqrt{x}+2}\) 

So sánh P với \(P^2\)

P với \(\sqrt{P}\)

R2=\(\dfrac{U}{I}\)=\(\dfrac{40}{0.5}\)=80 ôm

R tương đương = R1+R2=80+15=95 ôm

P=UI=40.0,5=20 W

R=\(\dfrac{U}{I}\)=\(\dfrac{220}{0.75}\)=\(\dfrac{880}{3}\)ôm

P=UI=0,75.220=165 W

1 ôm

2\(\dfrac{I1}{I2}\)=\(\dfrac{R1}{R2}\)=tự tính

3 P=UI

=> I = \(\dfrac{P}{U}\)=3:6=0.5

R=\(\dfrac{U}{I}\)=\(\dfrac{220}{0.75}\)=\(\dfrac{880}{3}\)

P=UI=\(\dfrac{880}{3}\).220=