$x=5; $y=10; echo($x/$y)."[br][/br]"; echo$x%$y."[br][/br]"; echo$x.$y."[br][/br]"; echo$x!==$y 输出结果是什么？
$x=5; $y=10; echo($x/$y)."[br][/br]"; echo$x%$y."[br][/br]"; echo$x.$y."[br][/br]"; echo$x!==$y 输出结果是什么？
Tôi( ) chơi nhảy dây.
Tôi( ) chơi nhảy dây.
若随机变量X和Y独立同分布，则X=Y．
若随机变量X和Y独立同分布，则X=Y．
已知x.y.z为三个互不相同的正数,且y/x-z=x+y/z=x/y.求x:y
已知x.y.z为三个互不相同的正数,且y/x-z=x+y/z=x/y.求x:y
如果x与y商品是替代品,商品x价格下降,将使商品y.
如果x与y商品是替代品,商品x价格下降,将使商品y.
设X,Y的方差存在，且不等于0，则D(X+Y)=D(X)+D(Y)是X,Y.
设X,Y的方差存在，且不等于0，则D(X+Y)=D(X)+D(Y)是X,Y.
Ike's utility function is U(x;y) = 25xy. He has 12 units of good x and 8 units of y. Ben's utility function for the same two goods is U(x;y)=4x+4y. Ben has 9 units of x and 13 units of y.
Ike's utility function is U(x;y) = 25xy. He has 12 units of good x and 8 units of y. Ben's utility function for the same two goods is U(x;y)=4x+4y. Ben has 9 units of x and 13 units of y.
已知方程sinz-xyz=a确定了隐函数z=f（x，y），求∂z∂x，∂z∂y及∂2z∂x∂y．
已知方程sinz-xyz=a确定了隐函数z=f（x，y），求∂z∂x，∂z∂y及∂2z∂x∂y．
设有int x,y; 以下语句判断x和y是否相等，正确的说法是该语句___。 if (x=y) printf(" x is equal to y.");
设有int x,y; 以下语句判断x和y是否相等，正确的说法是该语句___。 if (x=y) printf(" x is equal to y.");
Mộttuầncómấyngày?Mộttuầncóngày. A: ba B: bảy C: tám D: năm
Mộttuầncómấyngày?Mộttuầncóngày. A: ba B: bảy C: tám D: năm