bài 1 tìm x
a/ 35 -15 x [ x-7 ] = 20
b/ 18 + 2 x [ x – 18 ] = 42
c/ 129 -17 x [ x -43 ] = 95
d/ x [ x-3 ] + x [ x-7 ] = 0
e/ [ x -2 ] [x -4 ] + [ X x 2 ] [ x -8 ] =0
g/ 20+2 x [ 16 + 3 ] = 18 + 3 [ x + 1 ]
h/ 4 [ x + 2 ] -15 = 3 [ x + 1 ] + 7
bài 1 tìm x
a/ 35 -15 x [ x-7 ] = 20
15 x (x – 7) = 35 – 20
15 x (x – 7) = 15
x – 7 = 15 : 15
x – 7 = 1
x = 1 + 7
x = 8.
b/ 18 + 2 x [ x – 18 ] = 42
2 x ( x – 18 ) = 42 – 18
2 x ( x – 18 ) = 24
x – 18 = 24 : 2
x – 18 = 12
x = 12 + 18
x = 30.
c/ 129 -17 x [ x -43 ] = 95
17 x ( x – 43)= 129 -95
17 x ( x – 43 )= 34
x – 43 = 34 : 17
x – 43 = 2
x = 2 + 43
x = 45.
d/ x [ x-3 ] + x [ x-7 ] = 0
e/ [ x -2 ] [x -4 ] + [ X x 2 ] [ x -8 ] =0
g/ 20+2 x [ 16 + 3 ] = 18 + 3 [ x + 1 ]
h/ 4 [ x + 2 ] -15 = 3 [ x + 1 ] + 7
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