Rút gọn: 3(2²+1)(2⁴+1)...(264+1)+1
Các bạn giúp mình vs
Cho biểu thức: 2(1-9x2)/3x2+6x : 2-6x/3x
a, Rút gọn M.
b, Tìm các giá trị nguyên của x để M có giá trị nguyên.
c.tìm các giá trị nguyên của x =2 ,x=1
các bạn giúp vơi mình đang thi
a: \(M=\dfrac{2\left(1-3x\right)\left(1+3x\right)}{3x\left(x+2\right)}\cdot\dfrac{3x}{2\left(1-3x\right)}=\dfrac{3x+1}{x+2}\)
Viết các biểu thức sau dưới dạng bình phương của 1 tổng hay 1 hiệu:
(x+ 3) (x+ 4) (x+ 5) (x+ 6) +1
x^2+y^2+2x+2y+2(x+1)(y+1)+2
x^2 - 2x(y+2)+y^2+4y+4
x^2+2x(y+1)+y^2+2y+1
Các bạn giúp mình vs ạ mình cảm ơn nhiều!
a: Ta có: \(\left(x+3\right)\left(x+4\right)\left(x+5\right)\left(x+6\right)+1\)
\(=\left(x^2+9x+18\right)\left(x^2+9x+20\right)+1\)
\(=\left(x^2+9x\right)^2+38\left(x^2+9x\right)+360+1\)
\(=\left(x^2+9x\right)^2+2\cdot\left(x^2+9x\right)\cdot19+19^2\)
\(=\left(x^2+9x+19\right)^2\)
b. \(x^2+y^2+2x+2y+2\left(x+1\right)\left(y+1\right)+2\)
\(=\left(x^2+2x+1\right)+2\left(x+1\right)\left(y+1\right)+\left(y^2+2y+1\right)\)
\(=\left(x+1\right)^2+2\left(x+1\right)\left(y+1\right)+\left(y+1\right)^2\)
\(=\left(x+1+y+1\right)^2=\left(x+y+2\right)^2\)
c. \(x^2-2x\left(y+2\right)+y^2+4y+4\)
\(=x^2-2x\left(y+2\right)+\left(y+2\right)^2\)
\(=\left(x-y-2\right)^2\)
d. \(x^2+2x\left(y+1\right)+y^2+2y+1\)
\(=x^2+2x\left(y+1\right)+\left(y+1\right)^2\)
\(=\left(x+y+1\right)^2\)
Cho D= (1/3+2x+1/3-2x) : 1/3+2x
a.với đk x# 3/2 , rút gọn
b.tính D vs x=3
Giải giúp mình nha các bạn , mình cảm ơn trước :))
a,Ta có D= (1/3+2x+1/3-2x):1/3+2x
=2/3:1/3+2x
=2+2x
=2(x+1)
b, Từ câu a ta có
D=2(x+1)
Với x=3
=>2(x+1)
=2.4=8
KL
a,Ta có D= (1/3+2x+1/3-2x):1/3+2x
=2/3:1/3+2x
=2+2x
=2(x+1)
b, Từ câu a ta có
D=2(x+1)
Với x=3
=>2(x+1)
=2.4=8
bạn nào bt thì giải giúp mình bài này vs : rút gọn P= \(\frac{3x^2+9x-3}{x^2+x-2}-\frac{x+1}{x+2}+\frac{x-2}{1-x}\)
\(=\frac{3x^2+9x-3}{x^2+x-2}-\frac{x+1}{x+2}-\frac{x-2}{x-1}\)
\(=\frac{3x^2+9x-3}{\left(x+2\right)\left(x-1\right)}-\frac{\left(x+1\right)\left(x-1\right)}{\left(x+2\right)\left(x-1\right)}-\frac{\left(x-2\right)\left(x+2\right)}{\left(x-1\right)\left(x+2\right)}\)
\(=\frac{3x^2+9x-3-\left(x^2-1\right)-\left(x^2-4\right)}{\left(x-1\right)\left(x+2\right)}\)
\(=\frac{3x^2+9x-3-x^2+1-x^2+4}{\left(x-1\right)\left(x+2\right)}\)
\(=\frac{x^2+9x+2}{\left(x-1\right)\left(x+2\right)}\)
a x/-2=-4/y=2/4
b 2/x=y/-3
d x+1/2=8/x+1
các bạn giúp mình với
a) x/-2=-4/y=2/4
*x/-2=2/4=>4x=(-2)x2=>x=-1
*-4/y=2/4=>(-4)x4=2y=>y=-8
b)2/x=y/-3
=>xy=-6(câu này đề hơi lạ)
c) x+1/2=8/x+1
=>16=(x+1)(x+1)=>x^2+2x+1=16=>(x+1)^2=16=>(x+1)^2=4^2=>x+1=4=>x=3
a) \(\dfrac{x}{-2}=\dfrac{-4}{y}=\dfrac{2}{4}\)
\(\Rightarrow\dfrac{x}{-2}=\dfrac{2}{4}\)
\(\Rightarrow x=\dfrac{-2.2}{4}=-1\)
\(\Rightarrow\dfrac{-4}{y}=\dfrac{2}{4}\)
\(\Rightarrow x=\dfrac{-4.4}{2}=-8\)
b) \(\dfrac{2}{x}=\dfrac{y}{-3}\)
\(\Rightarrow x.y=2.-3\)
\(\Rightarrow x.y=-6\)
\(\Rightarrow x\) và \(y\inƯ\left(-6\right)=\left\{^+_-1;^+_-2;^+_-3;^+_-6\right\}\)
\(\Rightarrow\left(x;y\right)=\left(-6;1\right);\left(1;-6\right);\left(6;-1\right);\left(-1;6\right);\left(-2;3\right);\left(3;-2\right);\left(2;-3\right);\left(-3;2\right)\) c) \(\dfrac{x+1}{2}=\dfrac{8}{x+1}\)
\(\Rightarrow\left(x+1\right).\left(x+1\right)=2.8\)
\(\Rightarrow\left(x+1\right)^2=16\)
\(\Rightarrow\left(x+1\right)^2=4^2\) hoặc \(\left(x+1\right)^2=\left(-4\right)^2\)
\(x+1=4\) hoặc \(x+1=-4\)
\(x=3\) hoặc \(x=-5\)
Mn ơi giúp mk vs nhanh nha mai mình học rùi
Rút gọn 3*(2^2+1)*(2^4+1)*...*(2^64+1)
=(2^2-1)*(2^2+1)*(2^4+1)*...*(2^64+1)
=(2^4-1)(2^2+1)*(2^4+1)*...*(2^64+1)
=(2^8-1)(2^8+1)*...*(2^64+1)
=...
=(2^64-1)(2^64+1)
=2^128-1
mk vua lm ra do!!!!!!
tks bạn nhưng mk làm ra lâu rồi sorry nha
(mặc dù mk vẫn tk cho bạn)
\(=\)\(\left(2^2-1\right)\times\)\(\frac{2^4-1}{2^2-1}\)\(\times\frac{2^8-1}{2^4-1}\)\(\times\)...\(\times\)\(\frac{2^{128}-1}{2^{64}-1}\)
\(=\)\(2^{128}\)\(-1\)
Rút gọn biểu thức (3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)
Các bạn giúp mình với, mình cảm ơn
Ta có: \(\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\)
\(=\dfrac{\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{2}\)
\(=\dfrac{\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{2}\)
\(=\dfrac{\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{2}\)
\(=\dfrac{\left(3^8-1\right)\left(3^8+1\right)\left(3^{16}+1\right)}{2}\)
\(=\dfrac{\left(3^{16}-1\right)\left(3^{16}+1\right)}{2}\)
\(=\dfrac{3^{32}-1}{2}\)
Rút gọn: (3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)(332 + 1)
A=(3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)(332 + 1)
A=(3-1)(3 + 1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)(332 + 1)
A=(32-1)(32 + 1)(34 + 1)(38 + 1)(316 + 1)(332 + 1)
A=(34-1)(34 + 1)(38 + 1)(316 + 1)(332 + 1)
A=(38-1)(38 + 1)(316 + 1)(332 + 1)
A=(316-1)(316 + 1)(332 + 1)
A=(332 - 1)(332 + 1)
A=364-1
=>A=(364-1) /2
Rút gọn biểu thức
(3+1).(3^2+1).(3^4+1).(3^8+1).(3^16+1).(3^32+1)
Giúp mình vs nha <3
Đặt \(A=\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\).Ta có :
\(=>\left(3-1\right)A=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
\(=>2A=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
\(=>2A=\left(3^4-1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
...............................................................................
Cuối cùng \(=>2A=3^{64}-1\).
\(=>A=\frac{3^{64}-1}{2}\)
Đặt \(A=\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
\(\Rightarrow2A=\left(3-1\right)\left(3+1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
\(=\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)\left(3^8+1\right)\left(3^{16}+1\right)\left(3^{32}+1\right)\)
\(=...........................................\)
\(=\left(3^{32}-1\right)\left(3^{32}+1\right)=3^{64}-1\)
\(\Rightarrow A=\frac{3^{64}-1}{2}\)
1, rút gọn -24/56 ; 1212/-4545 rồi so sánh 2 phân số
2, Tìm n thược N để n-1/n+2 rút gọn được
giải nhanh giúp mình vs mình phải đi học