化简 (x-1)-(2x^2+x-3)

解答

化简

(x - 1) - (2 x^{2} + x - 3)

- 2 x^{2} + 2

求解步骤

(x - 1) - (2 x^{2} + x - 3)

使用法则:

(a) = a

(x - 1) = x - 1

= x - 1 - (2 x^{2} + x - 3)

使用分配律:

- (a + b) = - a - b

- (2 x^{2} + x - 3) = - 2 x^{2} - x + 3

= x - 1 - 2 x^{2} - x + 3

对同类项分组

= - 2 x^{2} + x - x - 1 + 3

s im pl i f y (- 10)^{- 2}

5 \frac{2}{3} + 7 \frac{2}{3}

s im pl i f y 7 (2 x - 4) - (10 - 3 x)

s im pl i f y \frac{1}{1 + 2 i} + \frac{1}{1 + 7 i}

4 \div \frac{7}{6}