11. -150-12 × 10:3=... 12. (21 x 13) 170 + (-102) = ... 13. -20 × (75+(-50)) : (-100) = .... 14. (-115+45) x 27:30=... 15. 1.250+24 x 115-1.110-... 16. (-20-(-30)) × (-5) = . . . . 17. 175-15× (-8) + (-250) = ... 18. -15x (25+(-23)) - (-130) = .... 19. 54 (21-3)+ 60: (-12) = . . 20. 3.600:40 2.200:11 +3.500 : 70 = . . . .
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