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7,2 : [(2 1/2 - 0,3)x 1/4]= 7,2: [(2,5-0,3)x0,25]=7,2: (2,2x0,25)=
7,2:0,55=13,1
b)1/3 x(2,4 + 3,5)=0,3x5,9=1,77
6 1/4 + 2 1/2 x (5,2 - 1/5)=6,25+2,5x(5,2-0,2)=6,25+2,5x5 =6,25+12,5=18,75
a) x + 1/4 = 0,72
x=0,72-0,25
x=0,47
b) x - 2,3 =1 1/2
x=1,5+2,3
x=3,8
c) 3,1 - x = 1/4
-x=0,25-3,1
-x=-2,85/-1
x=2,85
d) 2,5 * x = 2/:2,5
x=0,8
e) x : 0,1 = 1/4
x:0,1=0,25/*0,1
x=0,025
f) 3,1 : x = 1/2 /*x
3,1=0,5x /:0,5
x=6,2
a) (2 1/2 + 0,25) * (1 1/11 - 8/11)=(2,5+0,25)*(12/11 - 8/11)=
2,75 * 4/11 = 2,75*0,4=1,1
b))(3 2/7 - 1/2) : (5 + 4/7 )= (23/7 - 1/2) : 5 4/7=
(46/14 - 7/14) : 39/7 = 39/14 * 7/39 = 1/2
c) 12 * (91/100 - 7/120 * 5)= 12 * (0,91 - 7/24) = 12 * (0,91-0,29) = 12 * 0,62 = 7,44
d) 2,228 * (4 1/5 + 3 1/2 - 7,7)= 2,228 * ( 4,2 + 3,5 - 7,7)
= 2,228 * 0 =0