1) -2/5-(3.7-2.2) = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 + 1.5 = -2/5 + 3/2 = -7/10 + 3/2 = (3 - 7)/10 = -4/10 = -2/5
2) 3(2x+4)/4 = 4x - 3/26x + 12 = 16x - 612 = 10x - 610x = 18x = 1.8
3) 4+(x+2)-(x-2) = 4 + x + 2 - x + 2 = 8При x=0.5: 4+(0.5+2)-(0.5-2) = 4 + 2.5 + 2.5 = 9
1) -2/5-(3.7-2.2) = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 - 1.5 = -2/5 + 1.5 = -2/5 + 3/2 = -7/10 + 3/2 = (3 - 7)/10 = -4/10 = -2/5
2) 3(2x+4)/4 = 4x - 3/2
6x + 12 = 16x - 6
12 = 10x - 6
10x = 18
x = 1.8
3) 4+(x+2)-(x-2) = 4 + x + 2 - x + 2 = 8
При x=0.5: 4+(0.5+2)-(0.5-2) = 4 + 2.5 + 2.5 = 9