Question

va rog e urgent dau coroana+ma abonez​

Answer 1

Răspuns:

Explicație pas cu pas:

a.   3/7x77+2/5x77=

     33+(2x77)/5=

      33+154/5=

      (165+154)/5=319/5

b. 3x5+3x1/4+3x17/16=

    15+3/4+51/16=

     (240+12+51)/16=303/16

c.  2/5x7+3x7-7x12/5=

    14/5+21-84/5=

    (119-84)/5=35/5=7

d.  3/19x3/7+3/19x4/7=

    9/133+12/133=(9+12)/133=21/133

e.   2/23x3/5-2/5x3/46=

      6/115-3/115=(6-3)/115=3/115

f.  5x7/11+5x3/22-5x1/2=

    35/11+15/22-5/2=

  (70+15-55)/22=

    (85-55)/22=30/22=15/11