TÌM X, BIẾT.A) 723 – (7X – 152) = 714B) (2X – 130)
Bài 2 : Tìm x, biết.
a) 723 – (7x – 152) = 714
b) (2x – 130) : 4 + 213 = 5
2
+ 193
c) (x – 6)
2
= 9
d) 5
2x – 3
– 2.5
2
= 5
2
.3
e) (5
2
+ 3
2
).x + (5
2
– 3
2
)x – 50 = 10
2
2
2
2x – 3
2
2
2
2
2
2
2