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x-0,1x=0,9x
0,9x-0,2*0,9x=0,9x-0,18x=0,72x
0,72x=360 /:0,72
x=500
Odp. B
spr.
500-0,1*500=450
450-0,2*450 =360
15.
a=5/3-12/10*9/12 = 150/90 - 9/10=150/90-81/90=69/90=23/30
1/a=30/23 = 1⁷/₂₃
Odp. B
16.
√[(5-2√6)(5+2√6)] = √(25-24)=1
Odp. D
23.
log₇(2/98) = log₇1/49 = log₇7⁻² = -2
Odp. B
24.
4,2*10⁻⁶ = 4,2*10 * 10⁻⁶:10 = 42*10⁻⁷
Odp. B