Calculati si scrieti rezultatul sub forma de fractie zecimala:
a) 1supra2+5supra4; b)1supra9+3supra7; c)3supra8+13supra117; d)1supra6+3supra8; e)1supra5+7supra15+5supra8; f)1supra4+7supra24+5supra8; g)3+1supra4+2supra5; h)3supra11+4supra3+7supra12; I)1supra5-1supra7; j)7supra20-5supra18; k)8supra13-5supra39.

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Răspunsuri

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2014-11-18T08:39:38+02:00
a) 1/2+5/4=2/4+5/4=7/4

 b)1/9+3/7=7/63+27/63=34/63

c)3/8+13/117=351/936+104/936=455/936=35/72
 d)1/6+3/8=4/24+9/24=13/24
 e)1/5+7/15+5/8=24/120+56/120+75/120=155/120=31/24
 f)1/4+7/24+5/8=6/24+7/24+15/24=28/24=7/6
 g)3+1/4+2/5=60/20+5/20+8/20=73/20
 h)3/11+4/3+7/12=36/132+176/132+77/132=289/132
 I)1/5-1/7=7/35-5/35=2/35
j)7/20-5/18=63/360+100/360=163/360
 k)8/13-5/9=72/117-65/117=7/117

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