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100%=1
a) 5 5/25 + 1,72 = 5,2+1,72=6,92
6,92*4 = 27,68
b) (4 2/3 - 3,25) : (3 1/3 - 2,5) = (14/3-13/4):(10/3-5/2) = (56/12-39/12):(20/6-15/6) = 17/12:5/6 = 17/12*6/5 = 17/10=1,7
1,7*4=6,8
c)0,7 + 4,2 : 0,1 = 0,7+42=42,7
42,7*4 = 170,8
d) 2 1/4 : 0,8 - 1,2 = 2,25:0,8-1,2 = 2,8125-1,2 = 1,6125
1,6125*4 = 6,45
e) 1 1/5 + 5,8 * 1 1/4 = 1,2+5,8*1,25 = 1,2+7,25 = 8,45
8,45*4 = 33,8
f) 6,49 - 6/25 * 4 5/8 = 6,49-0,24*4,625 = 6,49-1,11 = 5,38