Question

calculati.......... va rog.... E urgent

Answer 1

a)
$\frac{5}{4} - \frac{7}{12} = \frac{15}{12} - \frac{7}{12} = \frac{8}{12} = \frac{2}{3}$
b)
$\frac{8}{3} \div \frac{16}{5} - \frac{1}{9} = \frac{8}{3} \times \frac{5}{16} - \frac{1}{9} = \frac{1}{3} \times \frac{5}{2} - \frac{1}{9}$
$\frac{1}{3} \times \frac{5}{2} - \frac{1}{9} = \frac{5}{6} - \frac{1}{9} = \frac{15}{18} - \frac{2}{18} = \frac{13}{18}$
c)
3/10+20/9:8/3
3/10+20/9×3/8
3/10+5/3×1/2
3/10+5/6
9/30+25/30=34/30=17/15

d)11/6-4/45:8/6
11/6-4/45×6/8
11/6-1/15×2/2
11/6-2/30
55/30-2/30
53/30

e)63/50:9/2+13/15
63/50×2/9+13/15
7/25×1/1+13/15
7/25+13/15
42/150+130/150
=172/150
=86/75

f)49/20:14/5+5/18
49/20×5/14
7/4×1/2+5/18
7/8+5/18
63/72+20/72
=83/72

Answer 2

Răspuns:

Explicație pas cu pas:

11.a.   1si1/4÷3/2-7/12=

         5/4÷3/2-7/12=

         5/4x2/3-7/12=5/6-7/12=

        [ (2x5)-7]/12=(10-7)/12=3/12=1/4

b.       8/3÷3si1/5-1/9=

         8/3÷16/5-1/9=

        8/3x5/16-1/9=

         5/6-1/9=

        [(3x5)-2]/18=

         (15-2)/18=13/18

c.    3/10+2si2/9÷8/3=

       3/10+20/9x3/8=

      5/(3x2)=5/6

d.    11/6-4/25÷2si2/3=

      11/6-4/25÷8/3=

      11/6-4/25x3/8=

      11/6-3/(2x25)=

      11/6-3/50=

     [ (25x11)-9]/150=

      (275-9)/150=

      266/150=133/75

e.   13/50÷9/2+13/15=

      13/50x2/9+13/15=

      13/(25x9)+13/15=

      13/225+13/15=

      [13+(15x13)]/225=

      (13+195)/225=208/225