化简 (3a)^2+(-2b)^2-(2a^2)

解答

化简

(3 a)^{2} + (- 2 b)^{2} - (2 a^{2})

7 a^{2} + 4 b^{2}

求解步骤

(3 a)^{2} + (- 2 b)^{2} - (2 a^{2})

使用法则:

- (a) = - a

- (2 a^{2}) = - 2 a^{2}

= (3 a)^{2} + (- 2 b)^{2} - 2 a^{2}

(3 a)^{2} = 9 a^{2}

(- 2 b)^{2} = 4 b^{2}

= 9 a^{2} + 4 b^{2} - 2 a^{2}

对同类项分组

= 9 a^{2} - 2 a^{2} + 4 b^{2}

s im pl i f y \frac{4}{13} \cdot o \cdot f_{2} \cdot \frac{3}{7} - \frac{68}{91} - [\frac{11}{2} - \frac{12}{3}]

s im pl i f y (21 - 2 x) (\frac{27.5}{2} - 2 \frac{x}{2}) x

s im pl i f y \frac{9 x ^{4}}{x}

s im pl i f y (a - b)^{3} - 8 (a + b)^{3}

f a c t or 10 u^{45} + 11 u