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nomor 2 = 45
nomor 3 =-40
nomor 4 =-62
nomr 5 =115
1. 25+50-(-40):10 = 75+ 40 : 10
= 75+ 4
= 79
2. (-14+20) × 11- 21 = 6 × 11 - 21
= 66 - 21
= 45
3. 50:10 +(-5) ×9 = 5 + (-45)
= - 50
4. -8+(-4)-10×5 = -12-50
= - 62
5. ( -11-4+20)×23 = 5 × 23
= 115