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1-A-1/8*20=1/8*20/1=20/8=2 1/2
1-D
1/2- 11,5
1-x
1/2x=11,5/:1/2
x=11,5*2/1
x=23
3B
251,5+164,5+172=588
5A
10/(1/7+0,5):9
10/(2/14+7/14):9
10/(9/14:9)
10/(9/14*1/9)
10/9/126
10/1*126/14=1260/14
odwrotność liczby 1260/14 to 14/1260
5D
2/5(10 1/3+13+12 2/3)
2/5(23+13)
2/5*36=14,4
pionowo
A-1
2 1/3*9*0,1=7/3*9/1*1/10=63/30=2 1/10
A-4
2,2:20=2 1/5:20=11/5:20=11/5*1/20=11/100
c-2
(2,2)^2=2,2*2,2=4,84
e-1
3 1/3
e4
2^6=64
64^2=32
2^5=32