a) 5 5/25 + 1,72 =
= 5,2 + 1.72 = 6,92
25%x=6,92
x=6.92:0,25
x=27,68
b)(4 2/3- 3,25):(3 1/3 - 2 1/2)=
=(4 2/3 - 3 1/4) : (3 1/3 - 2 1/2)=
= (4 4/12 - 3 3/12) : (3 2/6 - 2 3/6)=
=1 1/12 : 5/6= 13/12 * 6/5=
=13/10 =
=1,3
25%x=1.3
x=1,3 : 0,25
x=5,2
c)0,7+4,2:0,1=
= 0,7 +42=
=42,7
25%x=42,7
x=42,7:0,25
x=170,8
d)6,49 - 6/25 * 4 5/8=
=6,49 - 6/25*45/8=
= 6,49 - 27/20=
=6 49/100- 135/100=
=649/100 - 135/100=
=514/100=5,14
25%x=5,14
x=5,14:0.25
x=20,56
