Question

resolva as expressões

a) (-9) + 2,3 + 7,1 + (2,3)

b) 2,3 + (-6,8) + (-2,3) 5,4

c) 3/4 + 2/5 + (-2/5) + (-4/3)

d) 1/2 + (-1/4) + 3/2 + (-1/2) + 1/4

Answer 1

a) -9+2,3+7,1+2,3= -9+11,7= 2,7
b)2,3-6,8-2,3+5,4( eu n sei se é vezes ou +pois está sem sinal depois vc ver qual o correto) -6,8+5,4= -1,4
c) 3/4+2/5-2/5-4/3=90+24-24-80=10
d) 1/2-1/4+3/2-1/2+1/4= 1-1+6+1= 7

Answer 2

a)(-9)+2,3+7,1+2,3
-9+2,3+7,1+2,3
-6,7+7,1+2,3
0,4+2,3
2,7

b)2,3+(-6,8)+(-2,3)5,4
-4,5-2,3+5,4
-6,8+5,4
-1,4

c)3/4+2/5+(-2/5)+(-4/3)
3/4+2/5-2/5-4/3
15+8/20-2/5-4/3
23/20-2/5-4/3
23+8/20-4/3
15/20-4/3
45-80/60
-35/60 (÷5)
-7/12

d)1/2+(-1/4)+3/2+(-1/2)+1/4
1/2-1/4+3/2-1/2+1/4
4-2/8+3/2-1/2+1/4
2/8+3/2-1/2+1/4
2+12/8-1/2+1/4
14/8-1/2+1/4
14-4/8+1/4
10/8+1/4
10+2/8
12/8 (÷2)
6/4 (÷2)
3/2