а) (1.8-4.2)-(-3.3+5.1)
б) -(1\8+5\12)+(-1 1\3+1.5)
(1.8-4.2)-(-3.3+5.1)= -2,4-1,8=-4,2
-(1/8+5\12)+(-1 ц 1/3+1,5)=-13/24+1/6=9\24=3/8
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(1.8-4.2)-(-3.3+5.1)= -2,4-1,8=-4,2
-(1/8+5\12)+(-1 ц 1/3+1,5)=-13/24+1/6=9\24=3/8