a) 1+x *2+(40-x) * 5= 150 201 - 3x = 150 x = 17 b) x+2x+1/4x+3x=25l 25x/4 = 25l x = 4l c) 2/3x+1/5x+4=x 13x/15 + 4 = x 4 -2x/15 = 0 x = 30 d) (8-x)*5+x * 3,75= 27,5 -1,25(x - 32) = 27,5 40 - 1,25x = 27,5 12,5 - 1,25x = 0 x = 10 e) x+6 = 3x 6 = 2x x = 3 f) (14-x) * 5 = 38-x -5(x-14) = 38 - x 70 - 5x = 38 - x 32 - 4x = 0 x = 8 ---- Jeżeli pomogłem oceń, kliknij NAJ oraz podziekowania, Pozdrawiam, Kaliforn ; )
a) [latex]1+x *2+(40-x) * 5= 150 [/latex] [latex] 1+2x+200-5x=150 [/latex] [latex] -3x+201=150 [/latex] [latex]-3x=150-201 [/latex] [latex]-3x=-51/:(-3) [/latex] [latex]x=frac{-51}{-3}=17[/latex] b) [latex]x+2x+frac{1}{4}x+3x=25l [/latex] [latex]6frac{1}{4}x=25l [/latex] [latex]frac{25}{4}x=25l /*4 [/latex] [latex]25x=100l/:25 [/latex] [latex]x=4l[/latex] c) [latex]frac{2}{3}x+frac{1}{5}x+4=x /*15 [/latex] [latex]10x+3x+60=15x [/latex] [latex]13x+60=15x [/latex] [latex]13x-15x=-60 [/latex] [latex]-2x=-60/:(-2) [/latex] [latex]x=30[/latex] d) [latex](8-x)*5+x * 3,75= 27,5 [/latex] [latex] 40-5x+3,75x=27,5 [/latex] [latex]-1,25x=27,5-40 [/latex] [latex] -1,25x=-12,5 [/latex] [latex]-frac{125}{100}x=-frac{125}{10}/:(-frac{125}{100}) [/latex] [latex] x=frac{125}{10}:frac{125}{100} [/latex] [latex] x=frac{125}{10}*frac{100}{125} [/latex] [latex]x=10[/latex] e) [latex]x+6 = 3x [/latex] [latex] 3x-x=6 [/latex] [latex]2x=6/:2 [/latex] [latex]x=3[/latex] f) [latex](14-x) * 5 = 38-x [/latex] [latex]70-5x=38-x [/latex] [latex]-5x+x=38-70 [/latex] [latex]-4x=-32/:(-4) [/latex] [latex]x=8[/latex]
