展开 2^2-4(2)+4

解答

展开

2^{2} - 4 (2) + 4

0

求解步骤

2^{2} - 4 (2) + 4

去除括号:

(a) = a

= 2^{2} - 4 \cdot 2 + 4

数字相乘:

4 \cdot 2 = 8

= 2^{2} - 8 + 4

数字相加/相减:

- 8 + 4 = - 4

= 2^{2} - 4

2^{2} = 4

= 4 - 4

数字相减:

4 - 4 = 0

= 0

e x p an d, (60 + \frac{r}{3} - (30 + r))

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e x p an d 39 (32 - 321)

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e x p an d - \frac{4}{( 2 s - 1 ) ( s + 2 )}