Matematică
anaschipor28
2016-04-16 11:32:00
Determinați multimileA = { x€N | 7(4x - 3 )-4(3x-7)<71} C= { x€Z | (x-1)^2 + 7 > ( x+ 4)^2 }
Răspunsuri la întrebare
stefanr2007
2016-04-16 13:41:02

Sper ca se intelege. :)

danieldrew199
2016-04-16 13:42:17

[latex]A.~~~7(4x-3)-4(3x-7)<71[/latex] [latex]28x-21-12x-28<71[/latex] [latex]16x+7<71[/latex] [latex]16x<71-4[/latex] [latex]16x<64[/latex] [latex]x<64:16[/latex] [latex]x<4[/latex] [latex]xin{0 ; 1 ; 2 ; 3}[/latex] [latex]~~ \ ~~[/latex] [latex]C.~~~(x-1)^{2}+7>(x+4)^{2}[/latex] [latex]x^{2}-2x+1+7>x^{2}+8x+16[/latex] [latex]-2x+1+7>8x+16[/latex] [latex]-2x+8>8x+16[/latex] [latex]-2x-8x>16-8[/latex] [latex]-10x>8[/latex] [latex]x<-dfrac{8}{10}~~~simplifici~cu~2[/latex] [latex]x<-dfrac{4}{5}[/latex] [latex]-4:5=-0,8[/latex] [latex]xin{-0,7~;~-0,6~;~-0,5~;~infty[/latex]

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