Matemática
adricelo
8

Equação do primeiro grau : a) 5x = -30 b) 7x = 22 c) 4x = -20 d) x+8 = 2x e) 5 = 8 - x f) 2x+7 = x g) 3-x = 2 h) x-8 = 5 i) -3 = 2+x j) 4 = x+2 k) x-6 = 3 l) x + 2 = 7 Obrigado.

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(2) Respostas
cissaquimic

A ) 5x = - 30 x = - 30/5 x = - 6 B ) 7x = 22 x = 22/7 x = 3,14 C ) 4x = - 20 x = - 20/4 x = - 5 D) x + 8 = 2x x - 2x = - 8 - x = - 8 . ( - 1 ) x = 8 E ) 5 = 8 - x x = 8 - 5 x = 3 F ) 2x + 7 = x 2x - x = - 7 x = - 7 G ) 3 - x = 2 - x = 2 - 3 - x = - 1 . ( - 1 ) x = 1 H ) H ) x - 8 = 5 x = 5 + 8 x = 13 I ) - 3 = 2 + x - x = 2 + 3 - x = 5 . ( - 1 ) x = - 5 J ) 4 = x + 2 - x = 2 - 4 - x = - 2 . ( - 1 ) x = 2 K ) x - 6 = 3 x = 3 + 6 x = 9 L ) x + 2 = 7 x = 7 - 2 x = 5

larissardr2014

a) [latex]5x=30[/latex] [latex]x=\dfrac{30}{5}[/latex] [latex]\boxed{x=6}[/latex] b) [latex]7x=22[/latex] [latex]\boxed{x=\dfrac{22}{7}}[/latex] c) [latex]4x=-20[/latex] [latex]x=\dfrac{-20}{4}[/latex] [latex]\boxed{x=-5}[/latex] d) [latex]x+8=2x[/latex] [latex]2x-x=8[/latex] [latex]\boxed{x=8}[/latex] e) [latex]5=8-x[/latex] [latex]x=8-5[/latex] [latex]\boxed{x=3}[/latex] f) [latex]2x+7=x[/latex] [latex]2x-x=-7[/latex] [latex]\boxed{x=-7}[/latex] g) [latex]3-x=2[/latex] [latex]x=3-2[/latex] [latex]\boxed{x=1}[/latex] h) [latex]x-8=5[/latex] [latex]x=5+8[/latex] [latex]\boxed{x=13}[/latex] i) [latex]-3=2+x[/latex] [latex]x=-3-2[/latex] [latex]\boxed{x=-5}[/latex] j) [latex]4=x+2[/latex] [latex]x=4-2[/latex] [latex]\boxed{x=2}[/latex] k) [latex]x-6=3[/latex] [latex]x=3+6[/latex] [latex]\boxed{x=9}[/latex] l) [latex]x+2=7[/latex] [latex]x=7-2[/latex] [latex]\boxed{x=5}[/latex]

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