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2. =(4-3)×(4-3)-12×4+12):6= (1×1-48+12):6= -5,8
3. jeżeli na początku jest 1/5 (bo nie moge sie doczytać) to:
1/5×(-6,5)+ 2/3 ×4= -13/10 + 8/3= -41/30= -1 11/30