Các câu hỏi tương tự
cho 2 bieu thuc A=x+x^2/2-x va B=2x/x+1+3/x-2-2x^2+1/x^2-x-2 a, tinh gia tri cua A khi /2x-3/=1 b,tim dieu kien xac dinh va rut gon bieu thuc B c,tim so nguyen x de P=A.B dat gia tri lon nhat
mk dang can gap
cho bieu thuc:
\(A=\left(\frac{2+x}{2-x}-\frac{4x^2}{x^2-4}-\frac{2-x}{2+x}\right):\left(\frac{x^2-3x}{2x^2-x^3}\right)\)
a. Tim DKXD roi rut gon A
b. Tim x de A>0
c. Tinh gia tri cua A khi \(\left|x-7\right|=4\)
B1: rut gon bieu thuc
a, (x+y)^2-4(x-y)^2
b, 2(x-y)(x+y)+(x+y)^2+(x-y)^2
B2: tim X
a, (2X-1)^2-4(X+2)^2=9
b, 3(X-1)^2-3X(X-5)=21
B3: Cho bieu thuc
M=(x+3)^3-(x-1)^3+12x(x-1)
a, Rut gon bieu thuc tren
b, Tinh gia tri M tai x=-2/3
c, Tim x de M=16
cho bt \(A=\frac{x^2}{x^2-4}-\frac{x}{x+2}-\frac{2}{x-2}\)
a, tim x de ieu thuc A duoc xac dinh
b,rut gon bieu thuc A
c,tim gia tri nguyen cua x de A nguỵen
A=(x+1/2x+4/x+3 -2)/ x+1/x+3-x^2-5x+3/2x
a) tim dk cua x de A dc xac dinh
b) rut gon A
cho bieu thuc Q=[(x+1/x)^3-(x^6+1/x^6)-2]:[(x+1/x)^3+x^3+1/x^3].rut gon Q va tim min Q
Cho bieu thuc:
\(P=\frac{x+2}{x+3}-\frac{5}{x^2+x+6}+\frac{1}{2-x}\)voi \(x\ne-3;x\ne2\)
a, Rut gon P
b, tim x de \(P=\frac{-3}{4}\)
c,tim x nguyen de P dat gia tri nguyen
(mk dang can gap ai giai dung dau tien mk tick cho)
bai 1
a = (3x / 2x + 4 ) + (x +3 /x ^ 2 - 4 )
a . tim x de gia tri phan thuc a duoc xac dinh
b. rut gon a
c. tinh gia trin cua a khi x bang -3
d . tim gia tri cua x de phan thuc co gia tri bang 2
(2x-1)(3x+2)(3-x) rut gon bttim x: 9(x+)2-(3x-2)(3x+2)=10phan tich da thuc thanh nhan tu:x2-4x-5 , x2-25-2xy+y2 , x4+x2+1phep chia da thuc: CMR :
Xem chi tiết
a- a2(a+1)+2a(a+1) chia het cho 6 vs a la so nguyen
b- x2+2x+2>0 vs moi x