3.
[tex]Ob_1 = 4a\\40cm = 4a_1\\a_1 = 10cm\\Ob_2=24cm\\24cm=4a_2\\a_2=6cm\\P_t=\frac{10cm*6cm}{2}=10cm*3cm=30cm^2[/tex]
Odp. A
4.
[tex]\sqrt{49}=4+\sqrt{9}\\7 = 4+3\\\\\sqrt{49} = \sqrt{4}+9\\7 = 2+9[/tex]
Odp. B
5.
[tex]1\frac12*1\frac13*1\frac14*1\frac15=\frac32*\frac43*\frac54*\frac65=3[/tex]
Odp. B
6.
[tex]L = (2x+4)+(6x-6)+(9-3x)\\L = 2x+4+6x-6+9-3x\\L = 5x+7\\L = 5*x+7[/tex]
7.
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 (18 liczb)
Podzielne przez 4: 16, 20, 24, 28 (4 liczby)
[tex]\frac4{18} = \frac2{9}[/tex]
Odp. D
8.
Potega 6^18 jest rowna wynikowi mnozenia B. [tex]2^{18}*3^{18}=(2*3)^{18} = 6^{18}[/tex]
Potega 3^36 jest rowna wynikowi potegowania C. [tex](3^9)^4=3^{9*4}=3^{36}[/tex]
