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3 1/2*(2 1/3 - ?)=5:4 1/2+3 5/9
7/2(2 1/3 - x) = 5 : 9/2 + 3 5/9 = 5 * 2/9 + 3 5/9 = 10/9 + 3 5/9 = 1 1/9 + 3 5/9 =
= 4 6/9 = 4 2/3
7/2(2 1/3 - x) = 14/3 I *2/7
2 1/3 - x = 14/3 * 2/7
2 1/3 - x = 2/3 * 2
2 1/3 - x = 4/3 = 1 1/3
-x = 1 1/3 - 2 1/3
-x = -1
x = 1
zatem
3 1/2*(2 1/3 - 1)=5:4 1/2+3 5/9
B)
0,3*(? -4,7)=0,12:0,2-6:40
0,3x - 1,41 = 0,6 - 0,15
0,3x = 0,45 + 1,41
0,3x = 1,86 I :0,3
x = 6,2
zatem
0,3*(6,2 -4,7)=0,12:0,2-6:40