1. Tìm x a) x – 2/3 = 7/3 b) ( 3/15 – x ) . 1/3 = 2/5 c) |1/4 – 2x ) – 3/4 = 0 13/08/2021 Bởi Emery 1. Tìm x a) x – 2/3 = 7/3 b) ( 3/15 – x ) . 1/3 = 2/5 c) |1/4 – 2x ) – 3/4 = 0
a)X-2/3=7/3 X=7/3+2/3 ⇒X=3 b)(3/15-X).1/3=2/5 (3/15-X)=2/5:1/3 3/15-X=6/5 X=3/15-6/5 ⇒X=-1 c)1/4 – 2x| – 3/4 = 0 | 1/4 – 2x| = 0 + 3/4 | 1/4 – 2x| = 3/4 1/4 – 2x = 3/4 hoặc 1/4 – 2x = -3/4 2x = 1/4 – 3/4 hoặc 2x = 1/4 – (-3/4) 2x = -1/2 hoặc 2x = 1 x = -1/2 : 2 hoặc x = 1 : 2 x = -1/4 hoặc x = 1/2 Bình luận
Đáp án: a) x – 2/3 = 7/3 x = 7/3 + 2/3 x = 3 b) (3/15 – x) . 1/3 = 2/5 3/15 – x = 2/5 : 1/3 3/15 – x = 2/5 . 3 3/15 – x = 6/5 x = 3/15 – 6/5 x = 3/15 – 18/15 x = -1 c) |1/4 – 2x| – 3/4 = 0 | 1/4 – 2x| = 0 + 3/4 | 1/4 – 2x| = 3/4 1/4 – 2x = 3/4 hoặc 1/4 – 2x = -3/4 2x = 1/4 – 3/4 hoặc 2x = 1/4 – (-3/4) 2x = -1/2 hoặc 2x = 1 x = -1/2 : 2 hoặc x = 1 : 2 x = -1/4 hoặc x = 1/2 Hok tốt! Xin hay nhất! #Tamthatthat Bình luận
a)X-2/3=7/3
X=7/3+2/3
⇒X=3
b)(3/15-X).1/3=2/5
(3/15-X)=2/5:1/3
3/15-X=6/5
X=3/15-6/5
⇒X=-1
c)1/4 – 2x| – 3/4 = 0
| 1/4 – 2x| = 0 + 3/4
| 1/4 – 2x| = 3/4
1/4 – 2x = 3/4 hoặc 1/4 – 2x = -3/4
2x = 1/4 – 3/4 hoặc 2x = 1/4 – (-3/4)
2x = -1/2 hoặc 2x = 1
x = -1/2 : 2 hoặc x = 1 : 2
x = -1/4 hoặc x = 1/2
Đáp án:
a) x – 2/3 = 7/3
x = 7/3 + 2/3
x = 3
b) (3/15 – x) . 1/3 = 2/5
3/15 – x = 2/5 : 1/3
3/15 – x = 2/5 . 3
3/15 – x = 6/5
x = 3/15 – 6/5
x = 3/15 – 18/15
x = -1
c) |1/4 – 2x| – 3/4 = 0
| 1/4 – 2x| = 0 + 3/4
| 1/4 – 2x| = 3/4
1/4 – 2x = 3/4 hoặc 1/4 – 2x = -3/4
2x = 1/4 – 3/4 hoặc 2x = 1/4 – (-3/4)
2x = -1/2 hoặc 2x = 1
x = -1/2 : 2 hoặc x = 1 : 2
x = -1/4 hoặc x = 1/2
Hok tốt!
Xin hay nhất!
#Tamthatthat