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1-3x<1 ∧1-3x>-1
-3x<0 ∧ -3x>-2
x>0 ∧ x<2/3
x∈(0,2/3)
a)II-3+2I-(I-3I+I2I)I=II-1I-(3+2)I=I1-3I=I-2I=2
b)I√7-1I-I-3+√7I=*
√7-1>0 - pozostawiamy bez zmian
-3+√7<0 - zmieniamy znak, czyli zamieniamy na 3-√7
*=√7-1-(3-√7)=√7-1-3+√7=2√7-4