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受欢迎的代数 >

化简 (x+7)(x-7)-(x-6)(x+6)+13

解答

化简

(x + 7) (x - 7) - (x - 6) (x + 6) + 13

解答

0

求解步骤

(x + 7) (x - 7) - (x - 6) (x + 6) + 13

展开

(x + 7) (x - 7) : x^{2} - 49

= x^{2} - 49 - (x - 6) (x + 6) + 13

展开

- (x - 6) (x + 6) : - x^{2} + 36

= x^{2} - 49 - x^{2} + 36 + 13

对同类项分组

= x^{2} - x^{2} - 49 + 36 + 13

同类项相加:

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

= - 49 + 36 + 13

数字相加:

- 49 + 36 + 13 = 0

= 0

流行的例子

5 \frac{1}{3} \div \frac{1}{2}

e x p an d (4 + h)^{2}

s im pl i f y 83!

化简 7/(7^{1/4)}

s im pl i f y \frac{7}{7 ^{\frac{1}{4}}}

化简 (sin(x))/(1+sin(x))-(sin(x))/(1-sin(x))

s im pl i f y \frac{sin ( x )}{1 + sin ( x )} - \frac{sin ( x )}{1 - sin ( x )}