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1.7 4. 3/4+(2-1 11/21):4/9-1 4/7. (3/4+(1/2)²+1/3):1*1/6=. ( 4+ 2/7 ) + ( 2 + 3/7 ) - ( 3 - 4/7). 3/4+(-11 1/4)=.
3/4+(2-1 11/21):4/9-1 4/7. (3/4+(1/2)²+1/3):1*1/6=. ( 4+ 2/7 ) + ( 2 + 3/7 ) - ( 3 - 4/7). 3/4+(-11 1/4)=.

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