Odpowiedzi

2009-10-29T18:31:22+01:00
A) 1,1x=55/:1,1
x=50
b) 0,85x=170/:0,85
x=200
c) 0,3x=360/:0,3
x=4000
d) 2,2x=88/:2,2
x=40
2009-10-29T18:31:39+01:00
A)
a + 10% * a = 55
a+ 0,1 * a = 55
1,1 * a = 55
a = 55 * 10/11
a = 50
b)
a - 15% * a = 170
a - 0,15 * a = 170
0,85 * a = 170
a = 170 * 100/85
a = 200
c)
a - 70% * a = 360
a - 0,7 * a = 360
0,3 * a = 360
a = 360 * 10/3 = 1200
d)
a + 120% * a = 88
a + 1,2 * a = 88
2,2 * a = 88
a = 40
2009-10-29T19:40:29+01:00
To chyba tak :
a) 1,1x=55/:1,1
x=50
b) 0,85x=170/:0,85
x=200
c) 0,3x=360/:0,3
x=4000
d) 2,2x=88/:2,2
x=40