1.Calculati: a). 5 supra 6 + 1 supra 9. b). 2 supra 3+(-1 supra 4). c). -5 supra 12 + -3 supra 16 .

d). -3 supra 10+ -4 supra 15. e). 9 supra 20 + -8 supra 16. f). 1 supra 2 +1 supra 3 + (-1 supra 4)

g). 2 supra 21 + -13 supra42 +1 supra 70. h). 13 supra 36 + 1 supra 9+(-5 supra 9).


VA ROG DIN SUFLET SA MA AJUTATI!!!! URGENT!!! :*:*

1

Răspunsuri

2014-10-13T22:00:44+03:00
A) 5/6+1/9=(3·5+2·1)/18=(15+2)/18=17/18
b) 2/3-1/4=(2·4-1·3)/12=(8-3)/12=5/12
c)-5/12-3/16=(-5·4-3·3)/48=(-20-9)/48=-29/48
d) -3/10-4/15==(-3·3-4·2)/30=(-9-8)/30=-17/30
e) 9/20+8/16=(9·4+8·5)/80=36+40/80=76/80simplifica=19/20
f)1/2+1/3-1/4==(6+4-3)/12=7/12
g)2/21-13/42+1/70=
21=3·7
42=2·3·7
70=7·2·5
[21,42,70]=2·3·7·5=210
=(2·10-13·5+3)/210=(20-65+3)/210=(-45+3)/210=-42/210 simpl=-1/5
h) 13/36+1/9-5/9=13/36-4/9=(13-4·4)/36=(13-16)/36=-3/36=-1/13
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