展开 of(o,x,y)(x^2+2y^2=4)

解答

展开

o f (o, x, y) (x^{2} + 2 y^{2} = 4)

o x^{2} f (,, o x y) + 2 o y^{2} f (,, o x y) = 4

求解步骤

o f (o, x, y) (x^{2} + 2 y^{2} = 4)

= o f (,, o x y) (x^{2} + 2 \cdot 4 = y^{2})

使用分配律:

a (b + c) = ab + a c

a = o f (o, x, y), b = x^{2}, c = 2 y^{2} = 4

o f (o, x, y) x^{2} + o f (o, x, y) \cdot 2 y^{2} = 4

o x^{2} f (,, o x y) + 2 o y^{2} f (,, o x y) = 4

e x p an d \frac{d}{d x} ((10 x + 8) e^{x^{2}}) + cos (x)

e x p an d 40 (1 - e^{- 2 t} - 2 e t^{- 2 t})

e x p an d \frac{( ( 2 - y ) ^{3} )}{3}

e x p an d \frac{s ^{2} + 1}{s ( s + 3 )}

e x p an d (A + B) (B + A^{^{'}})