Răspuns:
9.a) 2x 40= 5x 16 ( 80=80)
b)7x20=4x35( 140=140)
c) 5x72= 8x45(360= 360)
d) 9x56= 8x63(504=504)
10. a) [tex]\frac{2}{3} =\frac{4}{6}[/tex] b) [tex]\frac{2}{4} =\frac{8}{16}[/tex]
c)[tex]\frac{2}{3} =\frac{6}{9}[/tex] d)[tex]\frac{2}{5} =\frac{4}{10}[/tex]
11.a) x= 4*9:3= 36:3= 12 x=12
b) x=8*7:2= 4*7=28
c) x= 3*8:4=24:4= 6
d) x=4*9:3=4*3=12
12. a) [tex]\frac{6}{7} =\frac{42}{49}[/tex] b) [tex]\frac{30}{35}[/tex]
c) [tex]\frac{54}{63}[/tex] d)[tex]\frac{48}{56}[/tex]
