C1 : 3x – 17 = x + 3
C2 :25 – ( x – 5 ) = -415 – ( 15 – 415 )
C3 : |x – 3|-12 =|-5|
C4 : (2x- 15) (3-x) = 0
C5 : 2x – 15 = -47
C1 : 3x – 17 = x + 3
C2 :25 – ( x – 5 ) = -415 – ( 15 – 415 )
C3 : |x – 3|-12 =|-5|
C4 : (2x- 15) (3-x) = 0
C5 : 2x – 15 = -47
Đáp án:
Giải thích các bước giải:
c1:3x-17=x+3
3x-x=3+17
2x=20
x=20:2=10
c2)25-x+5=-415-15+415
30 -X=-15
X=30+15=45
c3)!X-3!=12+5
!X-3! =17
Xet x-3=17⇒x=17+3
x=20
xet x-3=-17⇒x=-17+3
x=-14
C4) (2x-15)(3-x)=0
xet2x-15=0⇒2x=15
x= 15:2=15/2
xet 3-x=0⇒x=-3
D5) 2x-15=-47
2x=-47+15
2x=32
x=32:2
x=16