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zad.7 13,5-(-3,6)×(-1,7)=13,5-6,12=7,38
zad.8 [1 3/5+1 2/3]÷[(-4)-(-1 2/3) ]=2 4/15÷(-2 1/3)=34/15÷(-7/3)=34/15÷(-3/7)=34/35