Toán Lớp 6: a) (-300) :20 + 5.(3x-1) = 25
b) (5.13)^x = 25.(5^3 + 4.11)^2 : (3^4 – 3^5 :3^3 + 97) (x≥0)
c) (x-5).(3x-6) = 0
d) (2x + 1)^2.(x-6)>0
e) (x+1).(x-4)<0
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Toán Lớp 6: a) (-300) :20 + 5.(3x-1) = 25
b) (5.13)^x = 25.(5^3 + 4.11)^2 : (3^4 – 3^5 :3^3 + 97) (x≥0)
c) (x-5).(3x-6) = 0
d) (2x + 1)^2.(x-6)>0
e) (x+1).(x-4)<0
Comments ( 2 )
a) -15 + 15x – 5=25 ⇒ 15x = 25+15+5 ⇒ 15x = 45 ⇒ x = 3
c) (x-5).(3x-6)=0 ⇒ 3x² – 6x – 15x + 30 = 0 ⇒ 3x² – 21x + 30 = 0 ⇒ x=5, x=2
d) 4x² + 4x + 1× x-6 >0 ⇒ 4x² + 4x + x – 6 >0 ⇒4x² + 5x -6>0 ⇒ x<-2; x>3/4
e) x² – 4x + x – 4<0 ⇒ x² – 3x – 4<0
Mk xin 5 sao, cám ơn và cho mk câu hay nhất. Chúc bn học tốt và thi đc điểm cao
a) -15 + 15x – 5=25 ⇒ 15x = 25+15+5 ⇒ 15x = 45 ⇒ x = 3
c) (x-5).(3x-6)=0 ⇒ 3x² – 6x – 15x + 30 = 0 ⇒ 3x² – 21x + 30 = 0 ⇒ x=5, x=2
d) 4x² + 4x + 1× x-6 >0 ⇒ 4x² + 4x + x – 6 >0 ⇒4x² + 5x -6>0 ⇒ x3/4
e) x² – 4x + x – 4