137+4 (2x+3)=200(hình như đề bài sai)
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=10+5
x=15
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
137+4(2x+3)=200
4(2x+3)=200-137
4(2x+3)=63
2x+3=63:4
2x+3=\(\frac{63}{4}\)
2x=\(\frac{63}{4}\)-3
2x=\(\frac{51}{4}\)
x=\(\frac{51}{4}\):2
x=\(\frac{51}{8}\)
Vậy ...
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=15
Vậy...
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
Vậy...
k mik nhé
137 + 4 ( 2x + 3) =200
4 (2x+3)=200-137
4 (2x+3)= 63
(2x+3)=63:4
2x+3= 15,75
2x =15,75-3
2x = 12,75
x =12,75:2
x =6,375
200-6 . ( x-5) = 140
6 (x-5) = 200-140
6 (x-5) = 60
(x-5) =60:6
x-5 = 10
x =10-5
x =5
140 : (x-8)=7
(x-8)=140:7
x-8= 20
x =20+8
x=28