化简 (6x^2-2x+5)-(2x^2-7x-11)

解答

化简

(6 x^{2} - 2 x + 5) - (2 x^{2} - 7 x - 11)

4 x^{2} + 5 x + 16

求解步骤

(6 x^{2} - 2 x + 5) - (2 x^{2} - 7 x - 11)

使用法则:

(a) = a

(6 x^{2} - 2 x + 5) = 6 x^{2} - 2 x + 5

= 6 x^{2} - 2 x + 5 - (2 x^{2} - 7 x - 11)

使用分配律:

- (a - b) = - a + b

- (2 x^{2} - 7 x - 11) = - 2 x^{2} + 7 x + 11

= 6 x^{2} - 2 x + 5 - 2 x^{2} + 7 x + 11

对同类项分组

= 6 x^{2} - 2 x^{2} - 2 x + 7 x + 5 + 11

f a c t or - 2 x^{3} + 3 x^{2}

\frac{3}{4} - \frac{1}{2} \div \frac{6}{7}

s im pl i f y 3^{2} + 7^{2}

e x p an d (3 y - 4)^{2}

s im pl i f y 9 \times 12