Question

A) 1/3 + 5/2= B) 4/7 - 8/10= C) 2/5 + 3/6= D) 6/7 - 9/7=

Answer 1

a) $\frac{1,6 + 12,5}{5}$ = $\frac{14,1}{5}$ = 2,8

b) $\frac{40 - 56}{70}$ = $-\frac{16}{70}$ = $-\frac{8}{35}$

c) $\frac{12 + 15}{30}$ = $\frac{27}{30}$ = $\sqrt[9]{10}$

d) $-\frac{3}{7}$

Answer 2

Explicação passo-a-passo:

$A)\\ {1\over3}+{5\over2}=\\ \\ mmc(3,2)=6\\ \\ {2+15\over6}={17\over6}\\ -------------------\\ B)\\ {4\over7}-{8\over10}=\\ \\ mmc(7,10)=70\\ \\ {40-56\over70}=-{16\over70}=-{8\over35}\\ ------------------------$

$C)\\ {2\over5}+{3\over6}=\\ \\ mmc(5,6)=30\\ \\ {12+15\over30}={27\over30}=~~simplificando~~{27:3\over30:3}={9\over10}\\ --------------------------\\ D)\\ {6\over7}-{9\over7}=-{3\over7}$