展开 [(-4+9)-(+21)]+[(+8-25)+(-3-15)]

解答

展开

[(- 4 + 9) - (+ 21)] + [(+ 8 - 25) + (- 3 - 15)]

- 51

求解步骤

((- 4 + 9) - (21)) + ((8 - 25) + (- 3 - 15))

去除括号:

(a) = a

= - 4 + 9 - 21 + 8 - 25 - 3 - 15

数字相加/相减:

- 4 + 9 - 21 + 8 - 25 - 3 - 15 = - 51

= - 51

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