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anygoal [31]
3 years ago
7

1 bạn học sinh đi học từ nhà đến trường .Nửa đoạn đường đầu , bạn đi với vận tốc là 10km/h,nửa đoạn đường sau,bạn đi với vận tốc

là 15km/h.Tính Vtb của bạn học sinh trên cả quãng đường?
Mathematics
1 answer:
Marysya12 [62]3 years ago
5 0

Answer:

12km/h

Step-by-step explana:

Let's call the total distance 2a from which we can calculate t1 equivalent to the first half of the distance a/10 similar to t2 is a/15 from which the total time is a/6 . We have the average speed equal to the total distance dduowcngf divided by the total inferred time by 2a/(a/6) which equals 12km/h

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5.5 : 30.80 = 7 : x

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3 years ago
Tanya tiene un jardin con un foso alrededor. El jaidim el un rectangulo de 2 1/2m de largo y 2m de ancho. El jardin y el foso ju
professor190 [17]

Answer:

El área del foso es 5.5 m²

Step-by-step explanation:

Hola!

Por favor, mira el esquema adjunto para una descripción del problema.

Viendo la figura, podemos deducir que el área del foso será igual al área del rectángulo formado por el jardín y el foso menos el área del jardín.

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El área del foso es 5.5 m²

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3 years ago
Whats 17-12 5/9 equal?
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4.4 continuing ( in case you don't know it means the decimal continues forever, so 4.444444444444444444444444444 )

Hope this helps, if not, comment below please!!!!

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