CCacsbanj giải giúp mình câu 90 nhé ,xin cảm ơn các bạn
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\(90\cdot50+50\cdot9+50\)
\(=50\cdot\left(90+9+1\right)\)
\(=50\cdot100\)
\(=5000\)
Có 2 nghiệm
Đặt B=0
=>x^2-9=0
=>x^2=9
=>x=3 hoặc x=-3
`B=x^2-9=0`
`-> x^2=0+9`
`-> x^2=9`
`-> x^2=(+-3)^2`
`-> x=+-3`
Vậy, đa thức `B` có `2` nghiệm là `x={3 ; -3}`.
Ta có: lx-1l + l4-xl = 3 <=> lx-1l + lx-4l = 3
TH1: Nếu x < 1, ta có: TH2: Nếu 1 < x < 4, ta có: TH3: Nếu x > 4, ta có: 1 - x + 4 - x = 3 x - 1 + 4 - x = 3 x - 1 + x - 4 = 3 <=>5 - 2x = 3 <=> 3 =3 (TM) <=> 2x - 5 = 3
<=> 2x = 5 - 3 = 2 <=> x = 1;2;3;4 <=> 2x = 3 + 5 = 8 <=> x = 1 (TM) < => x = 4(TM) Vậy x = 1;2;3;4.
Me: What are you doing on Sunday afternoon?
Friend: I’m not doing anything. / Nothing much.
Me: Do you want to see a movie with me?
Friend: Sure. What movie is it?
Me: It's "The Journey to Mars".
Friend: What time does it start?
Me: It starts at 4 p.m.
Friend: Great! See you then.
Me: What are you doing on Saturday morning?
Friend: I’m free.
Me: Would you like to go to the movies with me?
Friend: Sounds good. What movie do you want to watch?
Me: How about "The Forest Book"?
Friend: What time is it on?
Me: It's at 10 a.m.
Friend: OK, let's meet at the cinema at 9:45.
a)52 ha 30 m2 = 520030 m2
b) 2508 dm2= 25 m2 8 dm2
c)12 tạ 6 kg = 1206 kg
đây nha
mong bạn cho mình 1 tick nha
a)52ha30m2=520030m2
b)2508dm2=25m2 8dm2
c)12 tạ 6kg=126kg
88+220=(23)8+220=224+220=224(216+1)=224x17chia het cho 17




