2. Упростите выражение:

а) 4т – 6т –3т + 7 + т;

б) –8(k – 3) + 4(k – 2) – 2(3k + 1);

в) 5/9(3,6a – 33/5b) – 3,5(4/7a – 0,2b).

[tex]1)4t-6t-3t+7+t=7-4t \\ 2)-8(k-3)+4(k-2)-2(3k+1)= \\ =-8k+24+4k-8-6k-2=-10k+14=14-10k \\ [/tex]

[tex]3) \frac{5}{9} (3.6a- \frac{33}{5} b)-3.5( \frac{4}{7} a-0.2b) \\ \\ 1) \frac{5}{9} * \frac{36}{10} a= \frac{4}{2} a=2a \\ \\ 2) \frac{5}{9} - \frac{33}{5} b= \frac{11}{3} b=2 \frac{2}{3} b \\ \\ 3) \frac{35}{10} * \frac{4}{7} a= \frac{5*2}{5} b=2a \\ \\ 4) \frac{35}{10} * \frac{2}{10} b= \frac{7}{2*5} b= \frac{7}{10} b \\ \\ 5)2a-2 \frac{2}{3} b-2a+ \frac{7}{10}b= -2 \frac{2}{3} b+ \frac{7}{10} b=-2 \frac{20}{30} b+ \frac{21}{30} b= \\ \\ =-1 \frac{50}{30} b+ \frac{21}{30} b=- 1\frac{29}{30} b[/tex]