展开 (0.1x+0.2y=5)(10)

解答

展开

(0.1 x + 0.2 y = 5) (10)

x + 2 y = 5

求解步骤

(0.1 x + 0.2 y = 5) (10)

= (10) (0.1 x + 5 \cdot 0.2 = y)

使用分配律:

a (b + c) = ab + a c

a = (10), b = 0.1 x, c = 0.2 y = 5

(10) \cdot 0.1 x + (10) \cdot 0.2 y = 5

乘开

(10) \cdot 0.1 x + (10) \cdot 0.2 y : x + 2 y

x + 2 y = 5

e x p an d (\frac{x}{3} + y^{2})^{5}

e x p an d (e^{x} + e^{2 x})^{2}

s im pl i f y (x - \frac{1}{2}) (x + \frac{1}{2})

s im pl i f y (1 + 2 i)^{5}

s im pl i f y 4 (sin^{4} (x) + cos^{4} (x))