bai 1 tinh
a)(x+3)^2
b)(2x+1)^2-(2x+3)(2x-3) giup em nhanh nhe
Những câu hỏi liên quan
bai 1 tinh
a (x-2)(x^2+2x+4)-x(x^2-1)
b (x+1)(x-3)-(x+4)(x-4) lam nhanh giup em nha cam on
a) \(=x^3-8-x^3+x=x-8\)
b) \(=x^2+x-3x-3-x^2+16=13-2x\)
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BAI 1 TINH
x ^ 2 . x - 2x^3
6 x^2 y . 3 xy - 2y ^2 .x +y
4x^2 + 5x -1 . 2x^3 - 3x
- 8 x^3y + 2 y^4 . 3xy^3 - 2 x^4 + 7y ^4
CAC BAN OI GIUP MINH NHE MINH DANG CAN GAP
Cac AC giup em bai nay voi a
Cho A=1=3=3^2+3^3+....+3^125
a,Thu gon A(Tinh A)
b,Tim chu so tan cung cua B
c,Tim x de 2A=3^2x-1
d,Chung minh rang A chia het cho 4
\(a,A=1+3+3^2+...+3^{125}\\ \Rightarrow3A=3+3^2+3^3+...+3^{126}\\ \Rightarrow2A=3^{126}-1\\ \Rightarrow A=\dfrac{3^{126}-1}{2}\\ c,2A=3^{2x}-1\\ \Rightarrow3^{126}-1=3^x-1\\ \Rightarrow x=126\)
\(d,A=\left(1+3\right)+\left(3^2+3^3\right)+...+\left(3^{124}+3^{125}\right)\\ A=\left(1+3\right)+3^2\left(1+3\right)+...+3^{124}\left(1+3\right)\\ A=\left(1+3\right)\left(1+3^2+...+3^{124}\right)\\ A=4\left(1+3^2+...+3^{124}\right)⋮4\)
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Tinh: 1/2N(x)=-x^3+2,5x^2-6+2x
Giai giup minh cau nay nhe.<3 <3<3
Giup mk not bai nay , dang gap !
Thuc hien phep tinh:
a, (x -2) ^3 -x(x+1)(x-1) + 6x(x -3)
b, (x-2)(x^2 - 2x +4)(x+2)(x^2 +2x + 4)
Thanks moi ng nha !
tinh so huu ti x
2/3x-3/12=4/5-(7/x-2)
2x-3/3+-3/2=5-3x/6-1/3
tim x
(x-1).(x-2)>0
2x-3<0
(2x-4).(9-3x)<0
moi nguoi giup minh nhe cam on nhieu
2^3.x+5^2=45-2x giup mik giai bai nay nhe mik can gap lam
Tim x thuoc \(Q\):
a) |5.(2x+3)|+|2.(2x+3)|+|2x+3|=16
b)|x2+|6x-2|| =x2+4
c)3x -|2x+1|=2
d)2.|x2+|x-1||=2x2+2
Cac anh chi CTV va cac ban giup mk nhe, mk dg can gap lem, nhanh len nhoa!! Tks truoc
\(\left|5\left(2x+3\right)\right|+\left|2\left(2x+3\right)\right|+\left|2x+3\right|=16\)
\(=8\left(2x+3\right)=16\)
\(\Rightarrow2x+3=2\)
\(\Rightarrow x=-\frac{1}{2}\)
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Bai 1: tinh
a(xy-2)(x^3-2x-6)
b(5x^3-x^2+2x-3)(4x^2-x+2)
\(\left(xy-2\right)\left(x^3-2x-6\right)=x^4y-2x^2y-6xy-2x^3+4x+12\)
\(\left(5x^3-x^2+2x-3\right)\left(4x^2-x+2\right)\)
\(=20x^5-5x^4+10x^3-4x^4+x^3-2x^2+8x^3-2x^2+4x-12x^2+3x-6\)
\(=20x^5-9x^4+19x^3-16x^2+7x-6\)
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