a) 17-x*2=13
=)-x*2=13-17
=)-x*2=-4
=)-x=-4:2
=)-x=-2
=)x=2
va nha
17 - x × 2 = 13
x × 2 = 17 - 13
x × 2 = 4
x = 4 : 2
x = 2
28 : x + 6 = 10
28 : x = 10 - 6
28 : x = 4
x = 28 : 4
x = 7
x × 5 - 17 = 23
x × 5 = 23 + 17
x × 5 = 40
x = 40 : 5
x = 8
40 - x : 9 = 37
x : 9 = 40 - 37
x : 9 = 3
x = 3 × 9
x = 27
A. Xx2=13+17
Xx2=30
X=30:2
X=15
B. 28:X=10-6
28:X=4
X=28:4=7
C. Xx5=23+17
Xx5=40
X=40:5
X=8
D. X:9=40-37
X:9=3
X=3x9
X=27
a) \(17-x\cdot2=13\)
\(x\cdot2=17-13\)
\(x\cdot2=4\)
\(x=4:2\)
\(x=2\)
b) \(\frac{28}{x}+6=10\)
\(\frac{28}{x}=10-6\)
\(\frac{28}{x}=4\)
\(\Rightarrow x=28:4=7\)
c) \(x\cdot5-17=23\)
\(x\cdot5=23+17\)
\(x\cdot5=40\)
\(x=40:5\)
\(x=8\)
d) \(40-\frac{x}{9}=37\)
\(\frac{x}{9}=40-37\)
\(\frac{x}{9}=3\)
\(x=3\cdot9\)
\(x=27\)