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= 434 + 975
= 1.409
2. 25 x 520 : 130 + 420 - 65 = 13.000 : 130 + 420 - 65
= 100 + 420 - 65
= 520 - 65 = 455
3. 367.234 - 77 x 15 + 17.594 : (-39) = 367.234 - 1.155 + 17.594 : (-39)
= 367.234 - 1.155 + (-451)
= 367.234 - 704 = 366.530
4. 210 : 70 - 150 x 15 = 210 : 70 - 2.250
= 3 - 2.250
= - 2.247
5. (497.000 - 24.980) : 15 - (-242) = 472.020 : 15 - (-242)
= 31.468 - (-242)
= 31.710