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2014-11-13T15:15:13+02:00
3(x+2)-1=x+7
3x+6-1=x+7
3x-x=7-6+1
2x=2
x=2/2
x=1
ce reprezinta x la al doilea exercitiu inmultire sau este X
18 000x-14 000+2 400-2 100+17=25 917
18 000x=25 917+14 000-2 400+2 100-17
18 000x=39 600
x=39600/18000
x=2,2
2014-11-13T15:34:21+02:00
3x + 6 - 1 = x + 7
3x - x = 7 + 1 - 5
2x = 3
x = 3/2
2. 100 * {10 * [(45x - 35) : 5 + 12] * 2 - 21} = 25917 - 17
100 * {10 * [4/5x - 7 + 12]* 2 - 21} = 25900
100 * [10 * (8/5x + 10) - 21] = 25900
100 * [ 80/5x + 100 - 21] = 25900
1600x + 7900 = 25900
1600x = 25900 - 7900
1600x = 18000
x = 18000 : 1600
x = 180 : 16
x = 45/4
x = 11 si 1/4
1 4 1