Question

Va rog dau coroana (clasa a 5 a)​

Answer 1

Răspuns:

Explicație pas cu pas:

6.

a). 1/2*(1/5+7/5)=1/2*8/5=8/10=4/5

    1/2*1/5+1/2*7/5=1/10+7/10=8/10=4/5

b). (1/4+1/16)*2/3=(4/16+1/16)*2/3=5/16*2/3=5/8*1/3=5/24

     2/3*1/4+2/3*1/16=2/12+2/48=8/48+2/48=10/48=5/24

c). 8/9*(1/2-1/3)=8/9*(3/6-2/6)=8/9*1/6=4/27

   8/9*1/2-8/9*1/3=8/18-8/27=4/9-8/27=12/27-8/27=4/27

d). (5/12-3/20)*15/8=(25/60-9/60)*15/8=16/60*15/8=1/2

    15/8*5/12-15/8*3/20=75/96-45/160=375/480-135/480=240/480=24/48=1/2

7.

a). 1/4*3+11/4*3=3*(1/4+11/4)=3*12/4=36/4=9

b). 1/13-1/5+1/13*1/8=1/13*(1/5+1/8)=1/13*(8/40+5/40)=1/13*13/40=1/40

c). 1/9*24-1/18*24=24*(1/9-1/18)=24*(2/18-1/18)=24*1/18=24/18=4/3

d). 1/5*1/6-1/5*1/15=1/5*(1/6-1/15)=1/5*(5/30-2/30)=1/5*3/30=3/150=1/50