1 . x + 1 = 4
x = 4 -1
x = 3
2 . 4 - x = 1
x = 4 - 1
x = 3
3. 1 -1 + 1-1 +2 -1 +1 -2=0
4. x- 9 = 2
x = 2 + 9
x = 11
x+1=4
x=4-1
x=3
4-x=1
x=4-1
x=3
1-1+1-1+2-1+1-2
0+0+1+-1
0
x-9=2
x=2+9
x=11
trả lời:
-x+1=4
=>x=3
-4-x=1
=>x=3
-1-1+1-1+2-1+1-2=0
-x-9=2
=>x=11
Học tốt!!!!!
a) x+1=4 b ) 4-x=1
x=4-1 x=4-1
x=3 x=3
c) 1-1+1-1+2-1+1-2
=(1-1)+(1-1)+(1-1)+(2-2)
=0+0+0+0
=0
d) x-9=2
x=2+9
x=11