展开 (x^1+x^2=2,)(x^1+x^2=-15)

解答

展开

(x^{1} + x^{2} = 2,) (x^{1} + x^{2} = - 15)

x^{1} x^{1} + x^{2} x^{1} = - 15 x^{1} + x^{2} = 2, x^{1} + x^{2} = 2, x^{2} = - x^{2} = 2, 15

求解步骤

(x^{1} + x^{2} = 2,) (x^{1} + x^{2} = - 15)

= (x^{1} + 2 =, x^{2}) (x^{1} + = x^{2} - 15)

打开括号

x^{1} x^{1} + x^{1} x^{2} = x^{1} (- 15) + x^{2} = 2, x^{1} + x^{2} = 2, x^{2} = x^{2} = 2, (- 15)

使用加减运算法则

+ (- a) = - a

x^{1} x^{1} + x^{2} x^{1} = - 15 x^{1} + x^{2} = 2, x^{1} + x^{2} = 2, x^{2} = - x^{2} = 2, 15

s im pl i f y (a x + 36 + 6 + 2 x) (a x + 36 - 6 - 2 x)

e x p an d (x - \frac{7}{3})^{2}

e x p an d \frac{( x + 6 ) ( x - 4 ) ( x + 9 )}{5 ( x + 1 ) ( x - 1 ) ( x + 8 )}

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

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