CM BẤT ĐẲNG THỨC
A;[-A^5.(-A^5)]^2+[-A^2.(-A^2)]^5=0
B;(-1)^N.A^N+K=(--A)^N.A^K
Chứng minh các đẳng thức sau:
a) \(\left[-a^5.\left(-a^5\right)\right]^2+\left[-a^2.\left(-a\right)^2\right]^5=0\)
b) \(\left(-1\right)^n.a^{n+k}=\left(-a\right)^n.a^k\)
cac bac giup em vs nha em dang can rrrrrrrrrrrratttttttt gap .tinh tichcac don thuc sau
a.[-1/2(a-1)x^3y^4z^2]^5
b.(a^5b^4xy^2x^n-1)(-b^3cx.x^4z^7-n)
trong do a,b,c,n la hang so
moo nguoi tick cho em se tick cho moi nguoi
a, A=2X2 _ 5X+ 1 BIET /X/=\(\frac{1}{3}\)
b, P= 3X2 +5X1 -1 BIET /X/=O,5
DANG 4 : LAP CAC TI LE THUC
H=1.a+2.a2+3.a3+....+n.an
rút gọn H < ai nhanh tick cho>
Cho ti le thuc a/b=c/d.Hay chung minh
ac / bd = a^2+c^2 / b^2+ d^2
Dat k nha cac ban
dang I. Tim gia tri bieu thuc
Bai 5: Cho x - y =9, tinh gia tri cua bieu thuc
B=\(\frac{4x-9}{3x+y}\)-\(\frac{4y+9}{3y+x}\)(x khac -3y, y khac -3x)
Bai 6: Hay viet cac da thuc duoi dang tong cua cac don thuc roi thu gon. tinh gia tri bieu thuc khi x=-1, y=1
a,D=4x(x+y)-5y(x-y)-4x\(^2\) b,E=(a-1)(x\(^2\)+1)-x(y+1)+(x+y\(^2\)-a+1)
moi nguoi giup minh di hu hu
Tinh gia tri bieu thuc
A=5a^3b^8 voi a=-1, b=1
B=-9a^4b^2 voi a=-1, b=2
C=ax+ay+bx+by biet a+b=-3, x+y=17
Minh dang can gap lam cac ban giup minh voi
tim tat ca cc so nguyen n thoa man cac dang thuc sau 25n/5n = 53n , ta co
A n=3
B n=-1
C n=1
D n=-3