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2014-08-29T08:44:42+03:00
A) 9+3*x=51
3*x =51-9
3*x =42
x=42:3
x=14

b)2*4*x=320
8*x=320
x=320:8
x=40

c)5*x:7=175
5*x=175*7
5*x=1225
x=1225:5
x=245
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2014-08-29T09:05:27+03:00
a) 9+3•x=51
9+3x=51
3x=51-9
3x=42
x=14

  b)2•4•x=320
  8x=320
x=320:8
x=40

  c) 5•x:7=175
   5x:7=175
  5x=175x7
 5x=1225
x=245