展开 7(x^2+4-4ln|x^2+4|)

解答

展开

7 (x^{2} + 4 - 4 ln x^{2} + 4)

7 x^{2} + 28 - 28 ln x^{2} + 4

求解步骤

7 (x^{2} + 4 - 4 ln x^{2} + 4)

打开括号

= 7 x^{2} + 7 \cdot 4 + 7 (- 4 ln x^{2} + 4)

使用加减运算法则

+ (- a) = - a

= 7 x^{2} + 7 \cdot 4 - 7 \cdot 4 ln x^{2} + 4

数字相乘:

7 \cdot 4 = 28

= 7 x^{2} + 28 - 28 ln x^{2} + 4

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