展开 2(2x-3y=5)

解答

展开

2 (2 x - 3 y = 5)

4 x - 6 y = 5

求解步骤

2 (2 x - 3 y = 5)

= 2 (2 x - 3 \cdot 5 = y)

使用分配律:

a (b - c) = ab - a c

a = 2, b = 2 x, c = 3 y = 5

2 \cdot 2 x - 2 \cdot 3 y = 5

乘开

2 \cdot 2 x - 2 \cdot 3 y : 4 x - 6 y

4 x - 6 y = 5

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

e x p an d \frac{9 x - 4}{( x + 2 ) ( x - 2 )}

e x p an d (y - 3 t y - t^{2}) d t + t^{2} d y

e x p an d \frac{11 ( x + h ) ^{2} - 3 ( x + h )}{h}

e x p an d 1 + csc (θ) (1 - sin (θ) = cot (θ) \cdot cos (θ))