tich minh cho minh len thu 8 tren bang sep hang cai
tich minh cho minh len thu 8 tren bang sep hang cai
rut gon bieu thuc
a/ (x+y)(x2-xy+y2)-(x-y)(x2+xy+y2)
b/ (x-y)2+ (x+y)2
Rut gon bieu thuc sau:
\(\frac{x^3y-xy^3+y^3z-yz^3+z^3x-x^3z}{x^2y-xy^2+y^2z-yz^2+z^2x-zx^2}\)
rut gon thuc (x^2-xy+y^2)(x^2+xy+y^2)
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 bieu thuc
\(P=\frac{x^2}{\left(x+y\right)\left(1-y\right)}-\frac{y^2}{\left(x+y\right)\left(x+1\right)}-\frac{x^2y^2}{\left(x+1\right)\left(1-y\right)}\)
Rut gon P= x+xy-y
DKXD \(x\ne y\); \(x\ne-1\):\(y\ne1\)
Tim x y de P nguyen duong thoa man \(x^2+y^2+3xy-x-3y=0\)
giup to 2 bai nay
1 giá trị của biểu thức x3-y3 vơi x-y=2 và xy=48
2 rut gon bieu thuc (a+b)3-(a-b)3-6a2b+7-2b3 ta duoc
rut gon A=xy^2-xz^2-y^3+yz^2/x^(z-y)+y^2(x-z)+z^2(y-x)
Thuc hien phep nhan rut gon roi tinh gia tri bieu thuc
B)x(x^2-y)-x^2(x+y)+y(x^2-x) tai x=1/2 va y=-100
Tinh gia tri bieu thucb=2(x^3+y^3)-3(x^2+y^2)voix+y=1