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1) <br />числитель:<br />(85 7/30 - 83 5/18 ) : 2 2/3 = <br />= (85 21/90 - 83 25/90 ) : 2 2/3 =<br />= 1 86/90 : (8/3) = <br />= 1 43/45 * 3/8 =<br />= (88 * 3) / (45 * 8) =<br />= (11*1) / (15*1) = 11/15<br />получилась дробь:<br />(11/15 ) / (1/25) = 11/15 : 1/25 = <br />= 11/15 * 25/1 =<br />= (11*5)/(3*1) = 55/3 = <br />= 18 1/3<br /><br />2) <br />числитель:<br />(140 7/30 - 138 5/12) : 18 1/6 =<br />= (140 14/60 - 138 25/60) : (109/6) =<br />= 1 49/60 * 6/109 = <br />= 109/60 * 6/109 = <br />= (1*1)/(10*1) =<br />= 1/10 = 0,1<br />получилась дробь:<br />0,1 / ( 1/500) = 0,1 / 0,002 = 100/2 = 50<br /><br />3) <br />числитель:<br />(95 7/30 - 95 5/18) * 2 1/4 + 373/1000 =<br />= (95 21/90 - 95 25/90 ) * 2 1/4 +0,373 =<br />= - 4/90 * 9/4 + 0,373 =<br />= - (1*1)/(10*1) + 0,373 =<br />= - 1/10 + 0,373 = <br />= - 0,1 + 0,373 =<br />= 0,373 - 0,100 = <br />= 0,273<br />получилась дробь:<br />0,273 / (1/5) = 0,273 : 0,2 = 273/200 = 1 73/200 = 1,365<br /><br />4) <br />числитель: <br />(49 5/24 - 46 7/20) *2 1/3 +3/5 =<br />= (49 25/120 - 46 42/120) * (7/3) + 3/5 =<br />= 2 103/120 * 7/3 +3/5 =<br />= (343*7)/(120*3) + 3/5 = <br />= 2401/360 + 216/360 =<br />= 2617/360 = 7 97/360<br />получилась дробь:<br />(7 97/360 ) / (1/5) =<br />= 2617/360 * 5/1 =<br />= 2617/72 =<br />= 36 25/72
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