Question

a 4 1/2+3*2 3/4= b 17/40-1/5:1 3/5= c 1 2/10:3/5-1 1/3*3/10= d 32-2*(7 2/5-2 1/2:10):6=

Answer 1

a)

4 1/2+3*2 3/4=4 1/2+3/1*11/4=4 1/2+33/4=4 1/2+8 1/4=4 2/4+8 1/4=12 3/4

b)

17/40-1/5:1 3/5=17/40-1/5:8/5=17/40-1/5*5/8=17/40-1/8=17/40-5/40=12/40=

=3/10

c)

1 2/10:3/5-1 1/3*3/10=12/10*5/3-4/3*3/10=4/2-4/10=2-2/5=1 3/5

d)

32-2*(7 2/5-2 1/2:10):6=32-2*(7 2/5-5/2*1/10)*1/6=

=32-2*(7 2/5-1/4)*1/6=32-2*(7 8/20-5/20)*1/6=

=32-2*7 3/20*1/6=32-2*143/20*1/6=32-143/60=32-2 23/60=29 37/60 

Answer 2

a) 4i1/2 + 3 * 2i3/4 = 4,5 + 3 * 2,75 = 4,5 + 8,25 = 12,75

 

b) 17/40 -1/5 : 1i3/5 = 17/40 - 1/5 : 8/5 = 17/40 - 1/5 * 5/8 = 17/40 -1/1*1/8=

     = 17/40 - 1/8 = 17/40 - 5/40 = 12/40 = 3/10

 

c) 1i2/10 : 3/5 - 1i1/3 *3/10 = 12/10 * 5/3 - 4/3 *3/10 = 4/2*1/1 - 2/1 * 1/5 =

   = 4/2 - 2/5 = 2 - 2/5 = 1i5/5 - 2/5 = 1 i 3/5

 

d) 32 - 2*(7i2/5 -2i1/2 : 10) : 6 = 32 - 2 * (7,4 -2,5:10):6 =32 - 2*(7,4-0,25):6=

    = 32 - 2 *7,15 : 6 = 32 - 14,30 : 6 = 32 - 2,38 = 29,62