Question

resolva as equações do 1° grau

a) 4x-9=12
b) 7(2+3x)=1
c) 3(1-x)+4(7+2x)=-5
d) x+5/2 = 3x-9/7
e) x+2/2 +1-x/3 + 3x+1/4 =2
f) (4x+6) -2x = (x-6)+10+14
g) (x-3)-(x+2) +2(x-1)-5=
h) 3x-2 (4x-3) =2-3(x-1)
i) 3(x-1)-(x-3)+5(x-2)=18
j) 5(x-3)-4(x+2)=2+3(1-2x)

PRECISO DOS CÁLCULOS​​​

Answer 1

Resposta:

a) 4x-9=12 <=> 4x=12+9 <=> 4x=21 <=> x=21/4

b) 7(2+3x)=1 <=> 14+21x=1 <=> 21x=1-14 <=> x=-13/21

c) 3(1-x)+4(7+2x)=-5 <=> 3-3x+28+8x=-5 <=> 5x+31-5=0 <=> 5x=-26 <=> x=-26/5

d) x+5/2 = 3x-9/7 <=> x-3x=-18/14-35/14 <=> -2x=-53/14 <=> x=(53/14)/2 <=> x=53/28

e) x+2/2 +1-x/3 + 3x+1/4 =2 <=> x-x/3+3x=2-1-1-1/4 <=> 4x-x/3=-1/4 <=> 12/3x -1/3x=-1/4 <=> 11/3x=-1/4 <=> x=(-1/4)/11/3 <=> x=-3/44

f) (4x+6) -2x = (x-6)+10+14 <=> -8x-12x=x+18 <=> -20x-x=18 <=> -21x=18 <=> x=-18/21