Đáp án:
Giải thích các bước giải:
Đáp án+Giải thích các bước giải:
`a^2+b^2+c^2+d^2`
`=a^2-2am+m^2+b^2-2bm+m^2+c^2-2cm+m^2+d^2-2dm+m^2-4m^2+2am+2bm+2cm+2dm`
`=(a-m)^2+(b-m)^2+(c-m)^2+(d-m)^2+2m(a+b+c+d)-4m^2`
`=(m-a)^2+(m-b)^2+(m-c)^2+(m-d)^2+2m.2m-4m^2`
`=(m-a)^2+(m-b)^2+(m-c)^2+(m-d)^2+4m^2-4m^2`
`=(m-a)^2+(m-b)^2+(m-c)^2+(m-d)^2`
`=>a^2+b^2+c^2+d^2=(m-a)^2+(m-b)^2+(m-c)^2+(m-d)^2(Đpcm)`
Cho tam giác ABC vuông tại A có AH là đường cao, AB=2cm, HC=3cm. Tính HA, HB, AC MÌNH CẦN gấp nha
lm giúp mình tất cả CH trg đề ạ
tìm phân số a phần b có giá trị bằng 72 phần 96 và BCNN (a;b)=480
4,8 x y+ y x 1,2 = 30,6 Tìm y
Tìm x biết a, 2 × x - 1 2/7 = 3 5/7 b, ( 125% + 3 3/4) × (x-2) = 25 c, (1/25+3/5 ÷ 5/8) × x - 1 Giúp mik với 🙏🇻🇳👏
Tìm x thuộc N 29 chia hết cho x dư 2 ; 79 chia hết cho x dư 4 ; 130 chia hết cho x dư 5
Làm nhanh giúp mình vs nhé mình sẽ vote cho 5 sao và ctlhn nhé
tìm x : 6/8 = x/20 các bạn giải nhanh hộ mình nhé
You should read books to_______ your knowledge. RICH Life in the countryside is much _______than life in the city. HEALTHY One of the causes of air pollution is ______ waste. INDUSTRY UNESCO is one of worldwide ______ organizations. NATION Ba left home early, ______, his bike was broken mid-way. LUCK Can you ______ yourself before we start our lesson? INTRODUCTION Will you please give us some _______ explanation? FAR Teenagers are now wearing................. dress. FASHION They are going to announce the ………….. of the Prince. ARRIVE She is one of the greatest ………….. to appear in this theater. PERFORM He was turned down for the job because he wasn’t..................... QUALIFY\ Cho dạng đúng của từ Help me~
Bài 2: Put in the correct word. 3. I think you behaved very .... .(selfish/selfishly) 4. Rose is .... upset about losing her job. (terrible/terribly) 5. There was a .... change in the weather. (sudden/suddenly) 6. Everybody at the party was .... dreesed. (colourful/colourfully) 7. Linda likes wearing .... clothes. (colourful/colourfully)
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