a,x × 9-x × 6=135 b,x × 7=324+x c,x × 8= 450 + x × 3

Đáp án:

Giải thích các bước giải:

a) x × 9-x × 6=135

x × (9-6) =135

x × 3 = 135

x = 135 : 3

x = 45

b) x × 7 = 324 + x

7x - x = 324

6x = 324

x = 324 : 6

x = 54

c) x × 8 = 450 + x × 3

8x = 450 + 3x

8x -3x = 450

5x = 450

x = 450 : 5

x = 90

$a)9x-6x=135$
$3x=135$
$x=45$
$b)7x=324+x$
$7x-x=324$
$6x=324$
$x=54$
$c)8x=450+3x$
$8x-3x=450$
$5x=450$
$x=90$