1) 0,1a - 0,1 = 0,15a - 5,10,1a - 0,15a = -5,1 + 0,1-0,05a = -5a = -5 / -0,05a = 100
2) 2x - 3/5 = 3 - 2x/72x + 2x/7 = 3 + 3/514x + 2x = 15 + 316x = 18x = 18 / 16x = 1.125
3) (-12 1/2)(-4/5) + 12,75 + (-2/13)(-3,9)-25/2 (-4/5) + 12,75 + 6/13 3,9(100/10) / (2/5) + 12,75 + 6/13 3,9(100/10) / (2/5) + 12,75 + 6/13 39/1050/1 * 5/2 + 12,75 + 234 / 130250/2 + 12,75 + 234 / 130125 + 12,75 + 234 / 130137,75 + 234 / 130137,75 + 1,8139,55
1) 0,1a - 0,1 = 0,15a - 5,1
0,1a - 0,15a = -5,1 + 0,1
-0,05a = -5
a = -5 / -0,05
a = 100
2) 2x - 3/5 = 3 - 2x/7
2x + 2x/7 = 3 + 3/5
14x + 2x = 15 + 3
16x = 18
x = 18 / 16
x = 1.125
3) (-12 1/2)(-4/5) + 12,75 + (-2/13)(-3,9)
-25/2 (-4/5) + 12,75 + 6/13 3,9
(100/10) / (2/5) + 12,75 + 6/13 3,9
(100/10) / (2/5) + 12,75 + 6/13 39/10
50/1 * 5/2 + 12,75 + 234 / 130
250/2 + 12,75 + 234 / 130
125 + 12,75 + 234 / 130
137,75 + 234 / 130
137,75 + 1,8
139,55