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Calculati a)[3/4+2/3:(3/4-1/2)]×6/41. b)[7/5:14/15+3/2:(9/4-1 intreg1/2)]×2/7. c)[5intreg2/3+1,(5)-2]:15intregi2/3. d)[4+6intregi2/3-2intregi1/4×(2/3-2/9)]:4 intregi5/6+29/4 urgent​