các bạn trả lời sai rồi đó chính là nước mắt

a) \(\left(\dfrac{2}{3}\right)^3.\left(\dfrac{-3}{4}^2\right).\left(-1\right)^5\)

\(=\dfrac{8}{27}.\dfrac{9}{16}.\left(-1\right)\)

\(=\dfrac{1}{6}.\left(-1\right)\)

=\(\dfrac{-1}{6}\)

b) \(\left(\dfrac{2}{5}\right)^2.\left(\dfrac{-5}{12}\right)^2\)

\(=\dfrac{4}{25}.\dfrac{25}{144}\)

\(=\dfrac{1}{36}\)

Lớp thú có những đặc điểm tiến hóa hơn so với các ngành động vật có xương sống khác là:

- Tim gồm có 4 ngăn (hai tâm thất, hai tâm nhĩ) máu đi nuối cơ thể là máu đỏ tươi, phổi có nhiều túi khí

- Răng phân hóa (răng cửa, răng nanh, răng hàm)

- Thai sinh (sinh con có nhau thai), nuôi con bằng sữa mẹ

- Bộ não phát triển

1.in/rather/The/spider/looks/car/of/form/weird/the/a

=> The car in the form of a spider looks rather weird

2.is/train/and/an/going to/in/arrive/Tom/half/hour/on/the/is

=> Tom is on the train and is going to arrive in half an hour

3.need/trains/planet/another/other/trains/travel/will/from/this/We/to/to

=> We will need space train to travel from this planer to another

1.in/rather/The/spider/looks/car/of/form/werid/the/a

=> The car in the form of a spider looks rather weird

2. is/train/and/an/going to/in/arrive/Tom/half/hour/on/the/is

=> Tom is on the train and is going to arrive in half an hour

3. need/space/planet/another/trains/travel/will/from/this/We/to/go

=> We will need space train to travel from this planet to another

4.big/How/drive/?/alternative/machinery/should/will/we/energy/use/ much

=> How much alternative energy will we use to drive big machinery

5.consumption/as/needs/energy/to/The/as/possible/reduced/much/be

=>The energy consumption needs to be reduced as much as possible