Question

Calculați 2x+0,15y unde x=[1,2(6)-3,5]:0,4(3) y=[17-4,1(13)]•495​

Answer 1

Răspuns:

x=[1,2(6)-3,5]:0,4(3)

x=[126-12/90-35/10]: 43-4/90

x=(114/90-35/10): 39/90

x=(19/15-7/2): 13/30

x=(19×2 /30 - 7×15 / 30) :13/30

x=(38-105/30)×30/13

x= - 67/30×30/13

x= - 67/13

y=[17-4,1(13)]•495

y=[ 17- (4113-41)/990]×495

y=( 17- 4072/990)×495

y=( 17- 2036/495)×495

y = [(17×495 - 2036)/495] ×495

y=(8415-2036/495) ×495

y=6379/495×495

y=6379

2x+0,15y=

2×(-67/13)+0,15×6379=

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