A) избавляемся от знаменателя, умножаем каждый член на 6
x²-4-3x=2x-8
x²-5x+4=0
D=25-24=1
x₁=5-1 / 2 = 2
x₂=5+1 / 2= 3
б) *2
2x²-1-2x+1=0
2x²-2x=0
2x(x-1)=0
2x=0 x-1=0
x₁=0 x₂=1
<span>During the week I always have to get up early for work so on Sunday I love to wake up late, usually around 9am and then get up 30 minutes later.</span><span>The first thing I do is switch on the coffee maker. No instant coffee for me today! On Sundays I always take the time to make some good coffee. While that's getting ready, I quickly throw onsome clothes and pick up a newspaper from the local shop.</span><span>With my coffee and paper, I spend the rest of the morning on the sofa. Sometimes I even turn offmy phone for a couple of hours so no one calls me.</span><span>Later in the day, I like to hang out with friends over lunch and catch up with their news and gossip.
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</span><span>All in all, that's my idea of a good day!
ну вот так как то))
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0,4х=6
х=15
15-100%
у-60%
у=15*60/100=9
ответ 9
1)
1) -2x+y-8x-8y-6=-10x-7y-6
2)3ab2+8a+7ab2-2=10ab2+8a-2=2(5ab2+4a-1)
3)тут расписывать нечего :), ответ = -5x
2)
1)a2+4a+6a-a2=10a тк а=3 то 10*3=30
2)5xy-3x2-6xy-7x2=-x*(y+10x) подставляем. =-2*(-1+10*2)=-2*19=-38
Sin²x + 2cos²x = 1
<span>(sin²x + cos²x) + cos²x = 1 </span>
<span>1 + cos²x = 1 </span>
<span>cos²x = 0 </span>
<span>cos x = 0 </span>
<span>x = ½π±πn</span>
