Potrzebuje pilnej pomocy w zadaniach z matematyki.
a)-8x+2+x<6-3x
b)4-2x+5<-5x+19
c)-5x+6+7x>-9x+12
d)7+3x<11-6x-16
zad2
a)V=v+xt
zad3
Cene towaru podniesiono o 15% a nastepnie obnizono o 18% i wynosila ona ostatecznie 471,5.Oblicz pierwotną cenę towaru.
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a) -8x+2+x<6-3x
-4x < 4
x > -1
b) 4-2x+5<-5x+19
3x < 10
x < 10/3
c) -5x+6+7x>-9x+12
2x + 6 > -9x +12
11x > 6
x > 6/11
d) 7+3x<11-6x-16
9x < -12
x < -12/9
3. 100%-18% = 82%
471,5 ---- 82%
x ----------100%
x= 471,5*100%/82%
x= 575zł
100%+15% = 115%
575zł -------115%
x---------100%
x=575 * 100% / 115%
x=500 zł
zad 2
V=v+xt
V-v = xt
V-v/t =x