Ответ:
5(-1,4a+3)-(1-2,5a)-4(0,8a+3) = - 7а+15 - 1+2,5а - 3,2а - 12= - 7,7а+2
при а=5/7
- 7,7*5/7 +2= - 77/10 * 5/7 +2= - 11/2 +2= - 5,5+2= - 3,5
5(-1.4a + 3) - (1 - 2.5a) - 4(0.8a + 3)= + 2
якщо а=[tex]\frac{5}{7}[/tex], то
[tex]-7.7*\frac{5}{7} +2=-\frac{77}{10} *\frac{5}{7}+2=-\frac{11}{2} +2=-5.5+2=-3.5[/tex]
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Ответ:
5(-1,4a+3)-(1-2,5a)-4(0,8a+3) = - 7а+15 - 1+2,5а - 3,2а - 12= - 7,7а+2
при а=5/7
- 7,7*5/7 +2= - 77/10 * 5/7 +2= - 11/2 +2= - 5,5+2= - 3,5
5(-1.4a + 3) - (1 - 2.5a) - 4(0.8a + 3)= + 2
якщо а=[tex]\frac{5}{7}[/tex], то
[tex]-7.7*\frac{5}{7} +2=-\frac{77}{10} *\frac{5}{7}+2=-\frac{11}{2} +2=-5.5+2=-3.5[/tex]