2 rút gọn a) (x+2)^2+2(x+1)=12 b) (x+2)^2-(x-2) (x+1)=3

Mọi người giúp em ý 2 câu a) và câu b), c) với ạ! Cảm ơn nhiều!

a)(2X+3)^2=9/25 b)(3-X)^3=-8/27 c)X+1/2=3/8 d)X^20=25.X^18

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Một ng đi đc 3phần8 quãng đường AB thì nghe thấy tiếng còi của 1 oto với V=60km/h Nếu ng ấy chạy ngược lại thì gặp oto ở A còn nếu chạy về phía đó thì oto sẽ đuổi kịp ng ấy ở B Tisng V của ng đó

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x+1/x +1=3x-1/x+1+1/x(x+1) nhanh và chi tiết giúp mình nha

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