Violympic toán 7
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TD
13 tháng 11 2016 lúc 10:08
gia tri cua x thoa man 2x+2/3x-6 = 2x-6/3x-15
tim gia tri cua bieu thuc X=2x^5-5y^3+2015 tai x,y thoa man /x-1/=(y+2)^20=0
gia tri x thoa man 0.(12):(x-1)=1.(6):0.(4)
Gia tri x thoa man : x/-8 = -18/x la...
tim gia tri nguyen cua x de bieu thuc:x^2+7/x+1 cung nhan gia tri la so nguyen
Cho 3 so khac nhau va khac 0 thoa man \(\dfrac{a}{b+c}=\dfrac{b}{a+c}=\dfrac{c}{a+b}\).Khi do gia tri cua \(P=\dfrac{b+c}{a}+\dfrac{a+c}{b}+\dfrac{a+b}{c}\)
tap hop cac gia tri nguyen x cua bieu thuc /2x + 2,5/+/2x -3/ dat gia tri lon nhat
Tim gia tri nho nhat cua bieu thuc A = \(|2x-2|\) + \(|2x-2013|\) voi x la so nguyen !?!?
tim cac gia tri cua x de bieu thuc sau co gia tri bang 0:
P(x)=2x-7+(x-14)
Q(x)=x^2-64