chuyen ve ta co a^2-b^2-a+b=0
<a-b><a+b>-<a-b>=0
<a-b><a+b-1>=0
a-b khac 0 nen a+b-1=0
=>a+b=1
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chuyen ve ta co a^2-b^2-a+b=0
<a-b><a+b>-<a-b>=0
<a-b><a+b-1>=0
a-b khac 0 nen a+b-1=0
=>a+b=1
cho tam thuc bac 2:P=ax^2+bx+c(a khac 0)
a,tim min P khi a>0
b,tim max P khi a<0
tim a,b (a>b>0) biet 2a^2+3b^2=7ab
cho a khac 0 b khac 0 va a+b=1 chung minh rang \(\frac{b}{a^3-1}-\frac{a}{b^3-1}=\frac{2\left(a-b\right)}{a^2b^2+3}\)
a; Xac dinh a; b de phep chia sau la phep chia het : 5x4+5x3+x2+11x+a chia het cho x2+x+b .Tim thuong voi a; b tim duoc ?
b; Tim x biet : x4-30x2+31x-30=0
Cho a>=0,b>=0 thoa man 2a+3b<=6 va 2a+b<=4.Tim max va min cua bieu thuc A=a^2 -ab -b^2
Ban nao biet giup minh voi.TKS
cho a,b,c la 3 so khac 0 va a+b+c=0 chung minh rang 1/a^2+b^2-c^2+1/b^2+c^2-a^2+1/c^2+a^2-b^2=0
mk can cau tra loi ngay mong moi nguoi giup do
Cho ab(x^2+y^2)+xy(a^2+b^2)=ab trong do a khac 0, b khac 0 a+b=1
CMR:a=b
tim cac chu so a,b,c doi 1 khac nhau biet 100a+10c+b+100c+10a+b=200a+20b+2c va b>c
a, b thoa b khac 0
a+b khac 0
\(a^2-2b^2=ab\)
\(M=\frac{a-b}{a+b}\)