1) 5*1/5 - 7*2/21 = 1 - 2/3 = 1/3
2) 12x - (3x - 5) + (9x - 3) = 12x - 3x + 5 + 9x - 3 = 18x + 2
3) 4(x+0,2) = 5x - 3,8; x = 4,6
4) -4(5x-0,1) + 18x + 2 = -2x+2,4; -2(-0,3)+2,4=0,6+2,4=3
c1) 0,4*6-3 и -0,4*6-3
-0,6 > -5,4
c2) S = 85t + 90t = 175t;
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Answers & Comments
1) 5*1/5 - 7*2/21 = 1 - 2/3 = 1/3
2) 12x - (3x - 5) + (9x - 3) = 12x - 3x + 5 + 9x - 3 = 18x + 2
3) 4(x+0,2) = 5x - 3,8; x = 4,6
4) -4(5x-0,1) + 18x + 2 = -2x+2,4; -2(-0,3)+2,4=0,6+2,4=3
c1) 0,4*6-3 и -0,4*6-3
-0,6 > -5,4
c2) S = 85t + 90t = 175t;