B(84)={84,168,336,420,504,...}

*cho mình xin 1 coin*

=41,0652173913043....

*cho mình xin 1 coin*

Đặt $S=\left(99+97+95+...+3+1\right)-\left(2+4+6+...+96+98\right)$

Đặt $A=99+97+95+...+3+1$

$B=2+4+6+...+96+98$

Số số hạng của A:

$\left(99-1\right):2+1=50$ (số)

$A=\left(99+1\right).50:2=2500$

Số số hạng của B:

$\left(98-2\right):2+1=49$ (số)

$B=\left(98+2\right).49:2=2450$

$\Rightarrow S=A-B=2500-2450=50$

$cho\; mình\; xin\; 1\; coin$

haha mình đùa =81000 nha

=1800 nha

*cho mình xin 1 coin*:))))

100mm

People are beginning to use home robots. They have advantages and disadvantages. We must carefully consider the pros and cons before welcoming these robotic helpers into our homes.

Using home robots has several advantages. They free us from repetitive chores like cleaning, allowing more time for leisure activities and family bonding. Some robots even interact and play games, becoming companions, especially for those living alone.

However, there are downsides to consider. Reliance on AI can lead to a decline in critical thinking skills. Just like relying on calculators weakens mental math abilities, constantly turning to robots for solutions could weaken our ability to think creatively and solve problems independently. Additionally, robots can cultivate laziness, as tasks are completed without effort. Furthermore, the cost of development and maintenance is high. Robots require expensive parts and programming for each specific task. This investment may not be feasible for everyone.

Home robots may make lives easier and happier, but there are certain problems as well. While home robots can answer questions, provide information, and work tirelessly, the potential drawbacks cannot be ignored.

Gọi x (học sinh) là số học sinh cần tìm (x ∈ ℕ* và 430 < x < 460)

Do khi xếp hàng 2; 3; 5 thì vừa đủ nên x là bội chung của 2; 3; 5

Ta có:

2 = 2

3 = 3

5 = 5

⇒ BCNN(2; 3; 5) = 2.3.5 = 30

⇒ BC(2; 3; 5) = B(30) = {0; 30; 60; 90; ...; 420; 450; 480; ...}

Mà 430 < x < 460 nên x = 450

Vậy số học sinh cần tìm là 450 học sinh

76.12 + 24.12 - 200

= 12.(76 + 24) -200

= 12.100-200

=1200-200

=1000

\(^{3^4}\).36 + \(4^3\).81 - 100

=81.36 + 64.81

=81.(36 + 64)-100

=81.100-100

=8100-100

=8000