IX Read the passage and write True (T) or False (F). There are a lot of benefits to have a robot in your house. Firstly, robots are useful. They can help us save a lot of time and energy. They help us do our housework such as cooking, doing laundry, feeding the babies and doing gardening as well. Besides, robots can help people protect their house by sending strange noise and signals for help. They never get bored, tired or complain anything about the hardship when they do too many things. However, the price for buying a robot is so high. It is so expensive that only rich families can buy it. 1. There is no benefit when having a robot. 2. Robots help you do your housework except feeding the babies. 3. They can guard your house and protect your house. 4. Robots are easy to get tired when doing too many things. 5. It is not cheap for people to buy a robot for their family.

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Mong mn giúp mấy bài này ;-; B1: Rút gọn biểu thức: a, $(a + b + c)^{3}$ - $(b + c - a)^{3}$ - $(a + c - b)^{3}$ - $(a + b - c)^{3}$ b, $(a + b)^{3}$ + $(b + c)^{3}$ + $(a + c)^{3}$ - 3 (a + b) (b + c) (c + a) B2: CMR nếu ($a^{2}$ + $b^{2}$ + $c^{2}$) ($x^{2}$ + $y^{2}$ + $z^{2}$) = $(ax + by + cz)^{2}$ với x, y, z khác 0 thì $\frac{a}{x}$ = $\frac{b}{y}$ = $\frac{c}{z}$ B3: Cho $(a+b)^{2}$ = 2($a^{2}$ + $b^{2}$). CMR a = b

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VIII Find the mistakes and correct: 1. A robot can builds houses, apartments and offices. A B C D 2. Scientists are working on how to invent a intelligent robot. A B C D 3. The children can work in groups when they were at school yesterday. A B C D 4. Children couldn’t stayed at home alone when they were 5 years old. A B C D 5. I don’t agree of you that a robot will be able to understand what people say. A B C D

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