Bài làm
( 3 + 6 + x ) . 9 = ( 2 - x ) . 2
27 + 54 + 9x = 4 - 2x
9x + 2x = 4 - 27 - 54
11x = -77
x = -7
Vậy x = -7
b) ( 6 - x ) . 3 = ( 9 + x ) . 3
18 - 3x = 27 + 3x
-3x - 3x = 27 - 18
-6x = 9
x = 9/-6
x = -3/2
Vậy x = -3/2
a,\(\text{(3+6+x) . 9 = (2-x).2}\)
\(27+54+9x=4-2x\)
\(9x+2x=4-54-27\)
\(11x=-77\)
\(\Rightarrow x=-7\)
b, \(\text{(6-x) . 3 = (9+x) . 3}\)
\(18-3x=27+3x\)
\(-3x-3x=27-18\)
\(-6x=9\)
\(\Rightarrow x=\frac{9}{-6}\)
học tốt
\(\left(3+6+x\right)9=\left(2-x\right)2\)
\(27+54+9x=4-2x\)
\(27+54+9x-4+2x=0\)
\(77+11x=0\)
\(11x=-77\)
\(x=-7\)
\(\left(6-x\right)3=\left(9+x\right)3\)
\(18-3x=27+3x\)
\(18-3x-27-3x=0\)
\(-9-6x=0\)
\(6x=-9\)
\(x=-\frac{3}{2}\)
(3+6+x) . 9 = (2-x).2
81 + 9x = 4 - 2x
81 - 4 = - 2x - 9x
77 = -11x
x = 77:(-11)
x = -7
(6-x) . 3 = (9+x) . 3
18-3x=27+3x
-3x-3x=27-18
-6x=9
x=9:(-6)
x=-1,5
