化简 (2m-3+7m^2)-(3-9m^2-2m)

解答

化简

(2 m - 3 + 7 m^{2}) - (3 - 9 m^{2} - 2 m)

16 m^{2} + 4 m - 6

求解步骤

(2 m - 3 + 7 m^{2}) - (3 - 9 m^{2} - 2 m)

使用法则:

(a) = a

(2 m - 3 + 7 m^{2}) = 2 m - 3 + 7 m^{2}

= 2 m - 3 + 7 m^{2} - (3 - 9 m^{2} - 2 m)

使用分配律:

- (a - b) = - a + b

- (3 - 9 m^{2} - 2 m) = - 3 + 9 m^{2} + 2 m

= 2 m - 3 + 7 m^{2} - 3 + 9 m^{2} + 2 m

对同类项分组

= 7 m^{2} + 9 m^{2} + 2 m + 2 m - 3 - 3

2 x - 1 \geq 0

f a c t or \frac{( \frac{1}{x} - \frac{1}{2} )}{x - 2}

x^{2} - 3 x - 8 = 0

f a c t or 16 m^{4} - 25 m^{2} n^{2} + 9 n^{4}

f a c t or 49 x^{16} - 16 y^{64}