1. Раскройте скобки:
a. + (m – 3 + ба)
b. - (a – b+c)
c. (15t + 23 - x)
d. - (-7- 9k +11)

2. Раскройте скобки и вычислите:
(2,5 + 38) – (0,5 – 22) - ​
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