Tìm x biết.
a) 15 - 3(x - 2) = 21;
b) 25 + 4(3 - x) = 1
c) 5 – x = 17 –(-5) ;
d) x – 12 = (-9) –(-15) ;
e) 9 –25 = (-7 – x ) – (25 - 7)
g) 11 + (15 - 11 ) = x – (25 - 9)
h) 3x + 12 = 2x - 4;
i) 14 - 3x = -x + 4 ;
k) 2(x - 2)+ 7 = x – 25
m) 17 – {-x – [-x – (-x)]}=-16
n) x + {(x + 3 ) –[(x + 3) – (- x - 2)]} = x
Loga
Sinh Học lớp 12
