Resolva as equações do 1° Grau:
a) -3(3x-42)=2(7x-52)
b) 23x-16=14-17x
c) 10y-5(1+y)=3(2y-2)-20
d) x(x+4)+x(x+2)=2x²+12
Soluções para a tarefa
Respondido por
2
a) -3(3x -42)= 2(7x -52)
-9x +126=14x -104
-9x -14x=-104 -126
-23x= -230 .(-1)
23x= 230
x =230/23
x=10
b)23x -16 =14 -17x
23x +17x=14 +16
40x=30
x=30/40
simplificando por 10:
x=3/4
c)10y -5(1 +y)= 3(2y -2) -20
10y -5 -5y= 6y -6 -20
10y -5y -6y= -26 +5
10y -11y= -21
-y= -21 .(-1)
y= 21
d) x(x +4) +x(x +2)= 2x² +12
x² +4x +x² +2x= 2x² +12
x² +x² -2x² +4x +2x= 12
2x² -2x² +6x =12
0 +6x =12
6x =12
x= 12/6
x=2
-9x +126=14x -104
-9x -14x=-104 -126
-23x= -230 .(-1)
23x= 230
x =230/23
x=10
b)23x -16 =14 -17x
23x +17x=14 +16
40x=30
x=30/40
simplificando por 10:
x=3/4
c)10y -5(1 +y)= 3(2y -2) -20
10y -5 -5y= 6y -6 -20
10y -5y -6y= -26 +5
10y -11y= -21
-y= -21 .(-1)
y= 21
d) x(x +4) +x(x +2)= 2x² +12
x² +4x +x² +2x= 2x² +12
x² +x² -2x² +4x +2x= 12
2x² -2x² +6x =12
0 +6x =12
6x =12
x= 12/6
x=2
Perguntas interessantes