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1.
a)2 2/5+3 3/5=12/5+18/5=30/5=6
b) 1/5 * 3/2 =3/10
c) (-2/3)³=-8/27

2.
a=3 a+1/a=3+1/3=(3*3+1)/3=10/3

3.
a=0,(3) = 3/9=1/3
b=2/3
a:b= 1/3 : 2/3 =1/3 * 3/2=1/2

4.
2,75-3+1,25+4,87+3+0,13=
=2,75+1,25+4,87+0,13=
=4+5=9

(1 2/3*5/7) *(3/2*7/5)*3/5=
=(5/3*5/7) *21/10*3/5=
=25/21 *21/10*3/5=
=5/1 *1/2*3/5=
=1/1 *1/2*3/1=
=3/2

Answer Link

Andrei25t Andrei25t · Answer 2 · 2016-11-19T16:33:52+02:00

1. [tex] 2 \frac{2}{5} +3 \frac{3}{5} = \frac{12}{5} + \frac{18}{5} = \frac{30}{5} =6 [/tex]

[tex] \frac{1}{5} * \frac{3}{2} = \frac{3}{10} [/tex]

[tex](- \frac{2}{3} ) ^{2} = \frac{4}{9} [/tex]

2. [tex]a+ \frac{1}{a} = 3+ \frac{1}{3} = \frac{10}{3} [/tex]

3. [tex]a= \frac{1}{3} =\ \textgreater \ a:b= \frac{1}{3} * \frac{2}{3} = \frac{2}{9} [/tex]
4. 2.75-3+1.25+4.87+3+0.13= (2.75+1.25)+(3-3) +(4.87+0.13)=4+5=9

[tex](1 \frac{2}{3} * \frac{5}{7} )*( \frac{3}{2} * \frac{7}{5} )* \frac{3}{5} = ( \frac{5}{3} * \frac{3}{2} )* (\frac{5}{7} * \frac{7}{5}) * \frac{3}{5} = \frac{3}{2} [/tex]